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    Pills in Petri dishes on gray background. — Stock Photo
    Pills in Petri dishes on gray background.
    Technician hand holding blood sample ready for testing in laboratory. — Stock Photo
    Technician hand holding blood sample ready for testing in laboratory.
    Technician holding urine sample for testing in laboratory. — Stock Photo
    Technician holding urine sample for testing in laboratory.
    Glass slide containing human sample under light microscope for medical testing. — Stock Photo
    Glass slide containing human sample under light microscope for medical testing.
    Variety of drugs on DNA autoradiogram, close-up. — Stock Photo
    Variety of drugs on DNA autoradiogram, close-up.
    Close-up of hands of scientist placing slide with human sample under light microscope for medical testing. — Stock Photo
    Close-up of hands of scientist placing slide with human sample under light microscope for medical testing.
    Scientists viewing sample on glass slide under light microscope. — Stock Photo
    Scientists viewing sample on glass slide under light microscope.
    Blood test kit and and analysis results — Stock Photo
    Blood test kit and and analysis results
    Close-up of hands of scientist placing slide with human sample under light microscope for medical testing. — Stock Photo
    Close-up of hands of scientist placing slide with human sample under light microscope for medical testing.
    Blood sample in kidney dish with urine sample on table. — Stock Photo
    Blood sample in kidney dish with urine sample on table.
    Drug research and clinical testing — Stock Photo
    Drug research and clinical testing
    Scientists viewing sample on glass slide under light microscope. — Stock Photo
    Scientists viewing sample on glass slide under light microscope.
    Close-up view of vacutainer with needle on tray. — Stock Photo
    Close-up view of vacutainer with needle on tray.
    Variety of potential drugs in petri dish on DNA autoradiogram. — Stock Photo
    Variety of potential drugs in petri dish on DNA autoradiogram.
    Pipette placing sample into test tube during experiment in laboratory. — Stock Photo
    Pipette placing sample into test tube during experiment in laboratory.
    Microbiologist working with petri dishes and test tubes in laboratory. — Stock Photo
    Microbiologist working with petri dishes and test tubes in laboratory.
    Scientists preparing blood sample for analysis under light microscope. — Stock Photo
    Scientists preparing blood sample for analysis under light microscope.
    Drug research and clinical testing — Stock Photo
    Drug research and clinical testing
    Close-up view of tubes with blood samples. — Stock Photo
    Close-up view of tubes with blood samples.
    Pill in Petri dish on gray background. — Stock Photo
    Pill in Petri dish on gray background.
    Pipette adding a solution to a sample — Stock Photo
    Pipette adding a solution to a sample
    Variety of potential drugs in petri dish on DNA autoradiogram. — Stock Photo
    Variety of potential drugs in petri dish on DNA autoradiogram.
    Microbiologist working with petri dish and test tubes in laboratory. — Stock Photo
    Microbiologist working with petri dish and test tubes in laboratory.
    Medical samples — Stock Photo
    Medical samples
    Pipette adding a solution to a sample — Stock Photo
    Pipette adding a solution to a sample
    Scientist examining specimen under microscope during clinical trial in laboratory. — Stock Photo
    Scientist examining specimen under microscope during clinical trial in laboratory.
    Scientists preparing multiwell plate with blood samples for testing and analysis. — Stock Photo
    Scientists preparing multiwell plate with blood samples for testing and analysis.
    Technician hand holding blood sample ready for testing in laboratory. — Stock Photo
    Technician hand holding blood sample ready for testing in laboratory.
    Variety of potential drugs in pharmaceutical vials and test tubes. — Stock Photo
    Variety of potential drugs in pharmaceutical vials and test tubes.
    Blood samples — Stock Photo
    Blood samples
    Researcher using a light microscope for studying tube containing blood sample. — Stock Photo
    Researcher using a light microscope for studying tube containing blood sample.
    Pipetting samples into microcentrifuge tubes — Stock Photo
    Pipetting samples into microcentrifuge tubes
    Hand of researcher holding vacutainer tube above pool of blood and syringe. — Stock Photo
    Hand of researcher holding vacutainer tube above pool of blood and syringe.
    Scientists preparing blood sample for analysis under light microscope. — Stock Photo
    Scientists preparing blood sample for analysis under light microscope.
    Drug research and clinical testing — Stock Photo
    Drug research and clinical testing
    Laboratory worker pipetting liquid into microcentrifuge tube. — Stock Photo
    Laboratory worker pipetting liquid into microcentrifuge tube.
    Pipette adding a solution to a sample — Stock Photo
    Pipette adding a solution to a sample
    Scientist selecting human blood sample in laboratory. — Stock Photo
    Scientist selecting human blood sample in laboratory.
    Scientist pipetting sample into micro centrifuge tubes ready for automated analysis. — Stock Photo
    Scientist pipetting sample into micro centrifuge tubes ready for automated analysis.
    Drug research and clinical testing — Stock Photo
    Drug research and clinical testing
    Drug research and clinical testing — Stock Photo
    Drug research and clinical testing
    Microbiologist working with petri dish and test tubes in laboratory. — Stock Photo
    Microbiologist working with petri dish and test tubes in laboratory.
    Pipette adding a solution to a sample — Stock Photo
    Pipette adding a solution to a sample
    Technician hand holding blood sample ready for testing in laboratory. — Stock Photo
    Technician hand holding blood sample ready for testing in laboratory.
    Doctor preparing HIV test sample for testing in laboratory. — Stock Photo
    Doctor preparing HIV test sample for testing in laboratory.
    Preteen girl breathing into peak flow meter and looking in camera. — Stock Photo
    Preteen girl breathing into peak flow meter and looking in camera.
    Pills in a Petri dish — Stock Photo
    Pills in a Petri dish
    Microbiologist pipetting into petri dish in laboratory. — Stock Photo
    Microbiologist pipetting into petri dish in laboratory.
    Medical worker gloved hands holding test stick in urine sample tube. — Stock Photo
    Medical worker gloved hands holding test stick in urine sample tube.
    Variety of potential drugs in pharmaceutical vials. — Stock Photo
    Variety of potential drugs in pharmaceutical vials.
    Scientists viewing sample on glass slide under light microscope. — Stock Photo
    Scientists viewing sample on glass slide under light microscope.
    Close-up of tube and syringe in hematology laboratory with scientist in background. — Stock Photo
    Close-up of tube and syringe in hematology laboratory with scientist in background.
    Laboratory worker pipetting liquid into microcentrifuge tube. — Stock Photo
    Laboratory worker pipetting liquid into microcentrifuge tube.
    Medical samples — Stock Photo
    Medical samples
    Vial of potential drug in petri dish on DNA autoradiogram. — Stock Photo
    Vial of potential drug in petri dish on DNA autoradiogram.
    Scientist viewing sample on glass slide under light microscope. — Stock Photo
    Scientist viewing sample on glass slide under light microscope.
    Pharmaceutical research. Potential new medicines and vaccines on electron micrograph of virus — Stock Photo
    Pharmaceutical research. Potential new medicines and vaccines on electron micrograph of virus
    Drug research and clinical testing — Stock Photo
    Drug research and clinical testing
    Pipette placing sample into test tube during experiment in laboratory. — Stock Photo
    Pipette placing sample into test tube during experiment in laboratory.
    Technician holding blood, urine and chemistry samples for clinical testing in gloved hand. — Stock Photo
    Technician holding blood, urine and chemistry samples for clinical testing in gloved hand.