WO2005030986A1 - 細胞観察装置および細胞観察方法 - Google Patents
細胞観察装置および細胞観察方法 Download PDFInfo
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- WO2005030986A1 WO2005030986A1 PCT/JP2004/014212 JP2004014212W WO2005030986A1 WO 2005030986 A1 WO2005030986 A1 WO 2005030986A1 JP 2004014212 W JP2004014212 W JP 2004014212W WO 2005030986 A1 WO2005030986 A1 WO 2005030986A1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/251—Colorimeters; Construction thereof
- G01N21/253—Colorimeters; Construction thereof for batch operation, i.e. multisample apparatus
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M41/00—Means for regulation, monitoring, measurement or control, e.g. flow regulation
- C12M41/30—Means for regulation, monitoring, measurement or control, e.g. flow regulation of concentration
- C12M41/36—Means for regulation, monitoring, measurement or control, e.g. flow regulation of concentration of biomass, e.g. colony counters or by turbidity measurements
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/02—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving viable microorganisms
- C12Q1/04—Determining presence or kind of microorganism; Use of selective media for testing antibiotics or bacteriocides; Compositions containing a chemical indicator therefor
Definitions
- the present invention relates to a cell observation device and a cell observation method for observing a cell reaction, and in particular, to a background art related to a cell observation device and the like suitable for screening in the process of drug development.
- Non-Patent Document 1 By culturing a large number of cells using a well-known synchronized culture method (for example, see Non-Patent Document 1), the state of such a large number of cells (for example, the timing of the cell cycle division phase) can be homogenized, and the drug It has been practiced to give a stimulus such as the introduction of a cell and observe the cell response. According to this method, the average response of a large number of cells can be observed.
- Non-Patent Document 1 Weimer R, Haaf T, Kruger J, Poot M, Schmid M. ⁇ Characterization of centromere arrangements and test for random distribution in G0, Gl, S, G2, Gl, and early S 'phase in human lymphocytes. Human Genetics 88: 673-682 (1992) Disclosure of the Invention
- Ion channels are the small conductance (SK) type 2 calcium-activated potassium channels.
- the measurement was performed by a well-known Western blot method using an anti-SK2 channel antibody.
- Figure 4 shows the measurement results.
- the horizontal axis in FIG. 4 is time, and the start time of the G1 phase of the cell cycle is set to 0, and the time of each of the S phase and the G2 / M phase is divided.
- the vertical axis of FIG. 4 represents the expression level of the ion channel in the relative distribution density (relative density). From these measurement results, it was found that the expression level of the ion channel increased or decreased depending on the stage in the cell cycle.
- the expression level of the ion channel and the cell response are correlated, so the above measurement results imply that the cell response changes depending on the stage in the cell cycle. I have. Specifically, in the case of the SK2 channel, reactivity is high in the G1 phase and low in the S phase and the G2 / M phase.
- An object of the present invention is to provide a cell observation device and a cell observation method capable of easily examining a correlation between an initial state of a cell and a reaction without using a synchronous culture method.
- the cell observation device of the present invention provides an image capturing device for capturing an image of a specimen including a plurality of cells.
- a step a stimulating unit for applying a predetermined stimulus to the plurality of cells, and an initial image of each of the plurality of cells based on the image captured by the image capturing unit before the stimulating unit applies the stimulus.
- a certifying means for certifying a state; and a detecting means for detecting a reaction of each of the plurality of cells due to the stimulus based on the image captured by the image capturing means after the stimulating means provides the stimulus.
- Generating means for generating correlation information between the initial state of each of the plurality of cells and the reaction.
- the certifying unit refers to a plurality of the images sequentially taken by the image taking unit before the stimulating unit gives the stimulus, and based on a morphological change of each of the plurality of cells. , An initial state of each of the plurality of cells.
- the certifying means certifies an initial state of each of the plurality of cells based on a morphological change associated with a cell cycle of each of the plurality of cells.
- the certifying means certifies each of the plurality of cells immediately before the stimulating means gives the stimulus as the initial state.
- the certifying unit certifies a phase shift of the cell cycle of each of the plurality of cells as the initial state.
- the cell observation device of the present invention may further include an image capturing unit that captures an image of a specimen including a plurality of cells, a stimulating unit that applies a predetermined stimulus to the plurality of cells, and before the stimulating unit applies the stimulus.
- an image capturing unit that captures an image of a specimen including a plurality of cells
- a stimulating unit that applies a predetermined stimulus to the plurality of cells
- the stimulating unit applies the stimulus. Referring to the plurality of images sequentially captured by the image capturing means, based on a morphological change associated with the cell cycle of each of the plurality of cells, the mitotic phase of each of the plurality of cells is specified, and Calculating means for calculating, for each of the plurality of cells, an elapsed time from a period of time until the stimulating means gives the stimulus; and A detection unit for detecting a response of each of the plurality of cells due to the stimulus; and a generation unit for generating correlation information between the elapsed time and the response of each of the plurality of
- the cell observation method of the present invention includes a first step of capturing an image of a specimen containing the plurality of cells before applying a predetermined stimulus to the plurality of cells; And after the second step, capturing an image of the specimen, A third step of detecting a response of each of the plurality of cells due to the stimulus, based on the image, and certifying an initial state of each of the plurality of cells based on the image captured in the first step; And a fourth step of generating correlation information between the initial state and the reaction.
- a plurality of the images are sequentially taken in, and in the fourth step, the plurality of images are referred to, and based on a morphological change of each of the plurality of cells, The initial state of each of the plurality of cells is identified.
- an initial state of each of the plurality of cells is identified based on a morphological change associated with a cell cycle of each of the plurality of cells.
- each state of the plurality of cells immediately before giving the stimulus is recognized as the initial state.
- a phase shift of the cell cycle of each of the plurality of cells is identified as the initial state.
- the cell observation method of the present invention further comprises a first step of sequentially capturing a plurality of images of a specimen containing the plurality of cells before applying a predetermined stimulus to the plurality of cells; A second step of obtaining an image of the specimen after the second step, and detecting a reaction of each of the plurality of cells due to the stimulus based on the image; and With reference to the plurality of images captured in one step, the mitotic phase of each of the plurality of cells is specified based on a morphological change associated with the cell cycle of each of the plurality of cells. A fourth step of calculating an elapsed time until the stimulus is applied to each of the plurality of cells, and generating correlation information between the elapsed time and the response.
- the correlation between the initial state of a cell and the reaction can be easily examined without using a synchronized culture method.
- FIG. 1 is a diagram showing an overall configuration of a cell observation device 10.
- FIG. 2 is a flowchart showing a procedure for observing a cell reaction.
- FIG. 3 is a schematic diagram showing a morphological change associated with a cell cycle.
- FIG. 4 is a result of examining a correlation between an initial state of a cell and a reaction using a conventional method.
- the cell observation device 10 of the present embodiment includes an electric XY stage 11, a heat retaining container 12, a pipette device 13, a transmission illumination unit (14, 15), and an epi-illumination unit (16-19). ), An optical microscope section (20-22), and a computer 23.
- a microplate 24 made of transparent polystyrene and having 96 wells 25 is mounted on the electric XY stage 11, for example.
- Each well 25 of the microplate 24 contains a specimen containing a large number of cells (live cells). Cells are sinking to the bottom of the well 25.
- the culture of the cells in the well 25 is performed by a general and simple method, rather than a method involving complicated operations such as a well-known synchronized culture method. For this reason, the state of many cells (for example, the timing of the division phase (M phase) of the cell cycle) in each well 25 is uneven.
- the electric XY stage 11 is a mechanism that moves the microplate 24 in the XY direction and positions one of the 96 wells 25 in the observation optical path 10A. With this electric XY stage 11, the center of each well 25 can be positioned in order on the observation optical path 10A.
- the electric XY stage 11 and the microplate 24 are arranged inside the heat retaining container 12.
- the heat retaining container 12 has an inlet 26 and outlets 27 and 28 provided on a wall of a heat insulating material.
- the air inlet 26 is arranged on the side, and the air outlets 27 and 28 are arranged on the upper and lower sides along the observation optical path 10A.
- a sufficient amount of air (temperature: 37 ° C., humidity: 100%, carbon dioxide gas: 5%) is supplied from the air inlet 26 into the heat insulating container 12. For this reason, even if there is some air escaping from the exhaust ports 27 and 28, the inside of the heat retaining container 12 is always kept under a constant condition.
- the established cell line has a constant cell cycle length under the same conditions (for example, 24 hours).
- the state of a large number of cells in each well 25 The non-uniformity of the phase appears as, for example, a phase shift in the cell cycle or a time shift in the mitotic phase of the cell cycle.
- the purpose of keeping the concentration of carbon dioxide constant is to keep the pH of the solution constant
- thermo insulation container 12 Above the thermal insulation container 12, a pipette device 13 and a transmitted illumination unit (14, 15) are arranged.
- the pipette device 13 and the transmitted illumination units (14, 15) can be moved, for example, along the X direction by a stage (not shown). Then, the pipette device 13 or the transmitted illumination units (14, 15) are inserted into the observation optical path 10A.
- FIG. 1 shows a state in which the transmitted illumination units (14, 15) are inserted into the observation optical path 10A.
- the pipette device 13 is a device for storing a drug (eg, protein acetylcholine) in a specified amount (not shown), and then introducing the drug into the well 25 of the microplate 24.
- a drug eg, protein acetylcholine
- the pipette device 13 is inserted into the observation optical path 10A. Then, the drug is introduced into one of the 96 wells 25 of the microplate 24, which is positioned in the observation optical path 10 ⁇ / b> A, through the exhaust port 27 of the heat retaining container 12.
- the transmitted illumination unit (14, 15) includes a light source 14 and a condenser lens 15, and is inserted into the observation optical path 10A when observing cells by transmitted illumination.
- the illuminating light from the light source 14 passes through the condenser lens 15 and the exhaust port 27 of the heat retaining container 12, and then, out of the 96 wells 25 of the microplate 24, one well positioned in the observation optical path 10A. It is incident on 25 and illuminates the cells in it.
- the light transmitted through the cells passes through the exhaust port 28 on the lower side of the heat retaining container 12, and is then guided to the optical microscope unit (20-22).
- An epi-illumination unit (16-19) is arranged below the heat retaining container 12 in addition to the optical microscope unit (20-22).
- the epi-illumination unit (16-19) includes a light source 16, an excitation filter 17, a dichroic mirror 18, and a fluorescent filter 19, and is inserted into the observation optical path 10A to observe cells by epi-illumination.
- the illumination light from the light source 16 is guided to the observation optical path 10A via the excitation filter 17 and the dichroic mirror 18, and passes through the objective lens 20 of the optical microscope section (20-22) and the exhaust port 28 of the thermal insulation container 12.
- one of the 96 wells 25 of the microplate 24 is incident on one well 25 positioned in the observation optical path 10A to illuminate the cells therein.
- Epi-illumination In the case of (1), the fluorescent dye previously introduced into the cells is excited by the illumination light. The fluorescent light emitted from the fluorescent dye passes through the exhaust port 28 on the lower side of the heat retaining container 12 again, and is then guided to the optical microscope (20-22).
- the optical microscope section (20-22) is composed of an objective lens 20, an imaging lens 21, and a camera 22.
- the light transmitted through the cells in the well 25 by the above-mentioned transmitted illumination enters the camera 22 via the objective lens 20 and the imaging lens 21.
- the fluorescent light emitted from the cells (fluorescent dye) in the well 25 by the above-mentioned epi-illumination enters the camera 22 via the objective lens 20, the dichroic mirror 18, the fluorescent filter 19, and the imaging lens 21.
- an enlarged image of the cell is formed on the imaging surface of the camera 22.
- the camera 22 captures the enlarged image and outputs image data to the computer 23.
- the computer 23 captures an image of a specimen (including a large number of cells) based on the image data output from the camera 22, and stores the image on the hard disk together with the shooting time. In addition, the computer 23 specifies the timing for capturing images from the camera 22 and
- a cell observation program that describes a procedure for observing a reaction of a cell with a drug based on the captured image is stored.
- the computer 23 observes the reaction of the drug-induced cells with reference to the cell observation program stored therein, according to the procedure of the flow chart of FIG. 2 (steps S1 to S5).
- step S1 the computer 23 transmits the image of the sample by the transmission illumination (14, 15) with the transmission illumination unit (14, 15) inserted into the observation optical path 10A and the pipette device 13 placed outside the observation optical path 10A. (Corresponding to a phase contrast microscope image) intermittently.
- the microplate 24 is moved in the XY direction by the motorized XY stage 11, and the center of the 96 wells 25 is positioned in the observation optical path 10 A in order, and an image of the specimen is captured in each state. . Then, these images are stored on the hard disk together with the shooting time. Further, when the photographing operation of all the wells 25 of the microplate 24 is completed, the same photographing operation is repeated from the first well 25 in order.
- the shooting operation in step S 1 is performed continuously for, for example, 24 hours.
- 720 images in the same field of view are stored in the hard disk of the computer 23 for each well 25 (the shooting interval is 2 minutes).
- Each image is associated with shooting time information.
- 24 hours corresponds to the length of the cell cycle. Therefore, a large number of cells in each of the wells 25 divide approximately once while the imaging operation in step S1 is continued.
- step S1 the 720 images of each well 25 stored on the hard disk are used to identify the mitotic phase (M phase) of each of a large number of cells in the well 25.
- the mitotic phase is specified in step S4 described below.
- Step S2 the transmitted illumination unit (14, 15) is retracted from the observation optical path 10A, and the microplate is driven by the electric XY stage 11 with the pipette device 13 inserted into the observation optical path 10A.
- the computer 23 While moving 24 in the XY direction, the computer 23 introduces the drug from the pipetting device 13 into each of the 96 wells 25 and simultaneously stimulates a large number of cells in each well 25.
- the type and concentration of the drug may be different in all the wells 25, or the same kind of drug may be introduced into a plurality of wells 25. Further, the drug is not limited to one kind in each well 25, and a plurality of kinds of drugs may be introduced into each well 25 in plural times.
- the computer 23 records the drug introduction time for each well 25.
- step S2 since the state of a large number of cells (that is, the timing in the cell cycle) in each well 25 is not uniform, the fact that the drug is introduced at once as in step S2 means that This means that the initial state (state before applying the stimulus) differs for each cell. Cells with different initial states respond differently to drugs (see Figure 4). Cells in the same initial state respond the same to drugs.
- Step S 3 while moving the microplate 24 in the XY direction by the electric XY stage 11, the computer 23 intermittently captures an image (equivalent to a fluorescent image) of the specimen by epi-illumination. Then, based on these images, the reaction of each of a large number of cells with each drug is detected. Detection of the reaction, for example, the fluorescence imaging power extracted the area of each cell Thereafter, the calculation is performed by calculating the luminance change of each cell region. Response by a drug corresponds to the effect of the drug.
- Step S4 the computer 23 determines the mitotic phase (M phase) of each of a large number of cells in the well 25 based on the 720 images acquired for each well 25 in Step S1. Is determined, and the elapsed time from each mitosis to drug introduction is calculated. This elapsed time corresponds to a time shift in the division phase (M phase) of each cell, in other words, a phase shift in the cell cycle. It can also be considered as the initial state of each cell (the state before applying the stimulus). In other words, in step S4, the elapsed time from the division period (M phase) of each cell to the introduction of the drug is recognized as the initial state.
- step S5 When the computer 23 finishes recognizing the elapsed time from the mitotic phase (M phase) of each cell to the introduction of the drug (that is, the initial state of each cell), the computer 23 proceeds to the final step S5, Generates correlation information between the elapsed time (initial state) and the reaction (drug effect) of each cell detected in step S3. Then, the process of observing the reaction by the drug is terminated.
- a synchronized culture method is used because a large number of cells in each well 25 simultaneously introduce a drug in a heterogeneous state and individually detect a reaction. It is possible to easily examine the correlation between the initial state of the cell and the response.
- the microplate 24 is used as a sample culture container, the reaction of cells by various types of drugs can be efficiently performed during screening in the process of drug development. Observable.
- the elapsed time from the division of each cell to the introduction of the drug is initially set.
- a time lag in the mitotic phase of each cell or a phase lag in the cell cycle may be identified as the initial state.
- a phase other than the mitosis may be used as a reference.
- the state of each cell immediately before the stimulus is applied (time in the cell cycle) may be determined as the initial state. In this case, the correlation between the cell cycle and the effect of the drug becomes clear.
- the characteristic amount relating to the area of the cell is analyzed, but the present invention is not limited to this.
- a fluorescent reagent such as Dipheny-Hexatriene (DPH)
- DPH Dipheny-Hexatriene
- a fluorescent image of the cell membrane is captured by epi-illumination, and the mitotic phase is determined based on its morphological change (that is, shape change). May be specified. The period when the cell membrane is circular is the mitosis.
- the cell nuclei using specifically stained fluorescent reagent captures the fluorescence image of the cell nuclei by epi-illumination, the shape change force may also be identified mitotic cells.
- the cell nucleus is oval in the interphase (other than the mitotic phase), but can easily be distinguished at the mitotic phase because it aggregates and becomes smaller.
- the following characteristics may be recognized as the initial state of the cell (state before stimulation is applied).
- the amount of calmodulin expressed in each cell may be used as an indicator.
- Intracellular caspases activated by "interaction between Fas ligand and Fas" by contact with immune cells that cause apoptosis may be detected.
- the activation of the apoptotic cascade may be detected by detecting an increase or decrease in the p53 protein.
- a phenomenon that causes an abnormality in a specific hydrolase in the body, such as lysosomal disease, may be detected.
- the dynamics of the initial endome taken up by endocytosis can be imaged by, for example, incorporating a stained water-soluble substance, and the intracellular accumulation and the like can be determined by observing the fluorescence. be able to.
- the above is mainly to detect the concentration and form of the fluorescence.
- the change in the binding substance and the ligand may be detected by detecting a change in the spectrum by FRET (fluorescence energy transfer) or the like, or may be detected by a time-resolved measurement device.
- the response of each cell was determined from the image information of the fluorescent calcium indicator. Changes in intracellular calcium ion concentration, or changes in membrane potential determined from image information of membrane potential-sensitive dyes, apoptosis determined from image information of caspase-labeled reagents, and changes in intracellular distribution of fluorescently labeled protein kinase , Cell migration, and loss due to cell death.
- the force of intermittently capturing a plurality of images in order to recognize the initial state of the cell is not limited thereto. Based on one image, the initial state of the cells (the state before applying the stimulus) may be identified.
- the stimulation was given to each cell by introducing a drug, but the present invention is not limited to this.
- the present invention is also applicable to a device for observing a cell response to a temperature change stimulus (such as a heat shock protein), a mechanical stimulus (such as a cell stretching stimulus), a light stimulus (such as a photoreceptor cell), or an electrical stimulus. Applicable.
- the response of the cells is observed by epi-illumination, but the reaction can be observed by transmitted illumination.
- the pipette device 13 is retracted from the observation optical path 10A, and the transmission illumination section (14, 15) is inserted again into the observation optical path 10A.
- the number of reactions is limited to one.
- correlation information between the plurality of reactions and an initial state may be obtained by extracting a plurality of reactions to one stimulus by image information. May be output.
- the reaction may be a change in intracellular calcium ion concentration obtained from the image information of the fluorescent calcium indicator and apoptosis obtained from the image information of the caspase-labeled reagent.
- pluripotent cells does not mean only a single type of cell having a different state, but may include a mixture of a plurality of types of cells (eg, glial cells and nerve cells).
- the cell observation device 10 including the transmission illumination units (14, 15) and the epi-illumination units (16-19) has been described as an example, but the present invention is not limited to this.
- the present invention can also be applied to a cell observation device provided with either the transmission illumination unit (14, 15) or the epi-illumination unit (16-19).
- the excitation filter 17, the dichroic mirror 18, and the fluorescence filter 19 are configured to be movable, for example, along the X direction by a stage (not shown) so that the image can be captured by transmitted illumination.
- the image captured before introducing the drug is read out in step S4 of FIG. 2, and the initial state of the cell is identified, but the present invention is not limited to this.
- the certification timing of the initial state of the cell may be between step S1 and step S2.
- the present invention is not limited to the above example, and an electric heater or a steam generator may be installed in the heat insulation container, and the temperature and humidity may be controlled by ON / OFF.
- the exhaust ports 27 and 28 of the heat retaining container are not limited to the openings, and may be glass windows. In this case, it is preferable that the upper exhaust port 27 can be opened and closed. The glass window of the exhaust port 27 is closed when observation is performed with the transillumination light, and is opened when the drug is introduced by the pipetting device 13.
- the pipette device for drug introduction is not limited to a device having a single tip, but may be a device having a plurality of tips.
- the reagent can be simultaneously introduced into a plurality of wells of the microplate.
- the present invention is not limited to the above example.
- Two tubes are introduced into a cell culture solution, a culture solution containing a drug is introduced from one of the tubes, and the surplus from the other is introduced.
- a configuration is conceivable in which the culture solution is sucked.
- a petri dish may be used as a culture vessel for specimens.
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EP04788279.0A EP1672078B1 (en) | 2003-09-29 | 2004-09-29 | Cell observation device, and cell observation method |
US11/390,419 US7415144B2 (en) | 2003-09-29 | 2006-03-28 | Cell observation device and cell observation method |
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JP2003337859A JP4454998B2 (ja) | 2003-09-29 | 2003-09-29 | 細胞観察装置および細胞観察方法 |
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US11/390,419 Continuation US7415144B2 (en) | 2003-09-29 | 2006-03-28 | Cell observation device and cell observation method |
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EP (1) | EP1672078B1 (ja) |
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Also Published As
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US20060210962A1 (en) | 2006-09-21 |
JP2005102538A (ja) | 2005-04-21 |
EP1672078A1 (en) | 2006-06-21 |
US7415144B2 (en) | 2008-08-19 |
EP1672078B1 (en) | 2013-07-31 |
EP1672078A4 (en) | 2010-02-10 |
JP4454998B2 (ja) | 2010-04-21 |
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