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    Scientist hand holding micro-centrifuge tube containing biological sample. — Stock Photo
    Scientist hand holding micro-centrifuge tube containing biological sample.
    Close-up 3D illustration of Y chromosome on white background. — Stock Photo
    Close-up 3D illustration of Y chromosome on white background.
    Close-up 3D illustration of XY chromosomes on white background. — Stock Photo
    Close-up 3D illustration of XY chromosomes on white background.
    Close-up 3D illustration of X chromosome on white background. — Stock Photo
    Close-up 3D illustration of X chromosome on white background.
    Set of 46 human chromosomes on black background. — Stock Photo
    Set of 46 human chromosomes on black background.
    Set of 46 human chromosomes on white background. — Stock Photo
    Set of 46 human chromosomes on white background.
    Close-up 3D illustration of XY chromosomes on white background. — Stock Photo
    Close-up 3D illustration of XY chromosomes on white background.
    Coloured scanning electron micrograph of 293T cell infected with human immunodeficiency virus. — Stock Photo
    Coloured scanning electron micrograph of 293T cell infected with human immunodeficiency virus.
    Coloured scanning electron micrograph of 293T cell infected with human immunodeficiency virus. — Stock Photo
    Coloured scanning electron micrograph of 293T cell infected with human immunodeficiency virus.
    Coloured scanning electron micrograph of 293T cell infected with human immunodeficiency virus. — Stock Photo
    Coloured scanning electron micrograph of 293T cell infected with human immunodeficiency virus.
    Close-up of pipetting sample into multiwell plate for analysis in laboratory. — Stock Photo
    Close-up of pipetting sample into multiwell plate for analysis in laboratory.
    Scientist preparing samples in microcentrifuge tubes for chemical analysis. — Stock Photo
    Scientist preparing samples in microcentrifuge tubes for chemical analysis.
    DNA test result on microcentrifuge tube with DNA sample in scientist hand. — Stock Photo
    DNA test result on microcentrifuge tube with DNA sample in scientist hand.
    Close-up of pipetting sample into multiwell plate for analysis in laboratory. — Stock Photo
    Close-up of pipetting sample into multiwell plate for analysis in laboratory.
    Close-up of pipetting sample into multiwell plate for analysis in laboratory. — Stock Photo
    Close-up of pipetting sample into multiwell plate for analysis in laboratory.
    Scientist holding DNA sample in tube with autoradiograph on DNA gel. — Stock Photo
    Scientist holding DNA sample in tube with autoradiograph on DNA gel.
    Close-up of pipetting sample into multiwell plate for analysis in laboratory. — Stock Photo
    Close-up of pipetting sample into multiwell plate for analysis in laboratory.
    Laboratory worker pipetting liquid into microcentrifuge tube. — Stock Photo
    Laboratory worker pipetting liquid into microcentrifuge tube.
    Scientist holding DNA sample in tube with autoradiograph on DNA gel. — Stock Photo
    Scientist holding DNA sample in tube with autoradiograph on DNA gel.
    Scientist holding DNA sample in tube with autoradiograph on DNA gel. — Stock Photo
    Scientist holding DNA sample in tube with autoradiograph on DNA gel.
    Scientist holding DNA sample in tube with autoradiograph on DNA gel. — Stock Photo
    Scientist holding DNA sample in tube with autoradiograph on DNA gel.
    Scientist pipetting sample in microcentrifuge tube for chemical analysis. — Stock Photo
    Scientist pipetting sample in microcentrifuge tube for chemical analysis.
    Laboratory worker pipetting liquid into microcentrifuge tube. — Stock Photo
    Laboratory worker pipetting liquid into microcentrifuge tube.
    Scientist pipetting sample in microcentrifuge tube for chemical analysis. — Stock Photo
    Scientist pipetting sample in microcentrifuge tube for chemical analysis.
    Scientist preparing samples in microcentrifuge tubes for chemical analysis. — Stock Photo
    Scientist preparing samples in microcentrifuge tubes for chemical analysis.
    Scientist preparing samples in microcentrifuge tubes for chemical analysis. — Stock Photo
    Scientist preparing samples in microcentrifuge tubes for chemical analysis.
    Scientists holding multiwell plate with chemical solution for analytical testing in laboratory. — Stock Photo
    Scientists holding multiwell plate with chemical solution for analytical testing in laboratory.
    Scientist pipetting sample in microcentrifuge tube for chemical analysis. — Stock Photo
    Scientist pipetting sample in microcentrifuge tube for chemical analysis.
    Laboratory worker pipetting liquid into microcentrifuge tube. — Stock Photo
    Laboratory worker pipetting liquid into microcentrifuge tube.
    DNA test result on microcentrifuge tube with DNA sample in scientist hand. — Stock Photo
    DNA test result on microcentrifuge tube with DNA sample in scientist hand.
    Scientist holding DNA sample in tube with autoradiograph on DNA gel. — Stock Photo
    Scientist holding DNA sample in tube with autoradiograph on DNA gel.
    Scientist preparing samples in microcentrifuge tubes for chemical analysis. — Stock Photo
    Scientist preparing samples in microcentrifuge tubes for chemical analysis.
    Female researcher studying DNA autoradiogram. — Stock Photo
    Female researcher studying DNA autoradiogram.
    DNA researcher pipetting into tube with reference in background. — Stock Photo
    DNA researcher pipetting into tube with reference in background.
    Researcher loading sample of DNA into agarose gel for separation by electrophoresis. — Stock Photo
    Researcher loading sample of DNA into agarose gel for separation by electrophoresis.
    Scientist gloved hand holding gene chip. — Stock Photo
    Scientist gloved hand holding gene chip.
    Female scientist examining DNA autoradiogram. — Stock Photo
    Female scientist examining DNA autoradiogram.
    Close-up of DNA autoradiogram with flasks in background. — Stock Photo
    Close-up of DNA autoradiogram with flasks in background.
    Pipette placing sample into test tube during experiment in laboratory. — Stock Photo
    Pipette placing sample into test tube during experiment in laboratory.
    Pipette adding sample to petri dish with DNA autoradiogram in background. — Stock Photo
    Pipette adding sample to petri dish with DNA autoradiogram in background.
    Variety of potential drugs in petri dish on DNA autoradiogram. — Stock Photo
    Variety of potential drugs in petri dish on DNA autoradiogram.
    Close-up of hand using multipipette for placing DNA onto agarose gel. — Stock Photo
    Close-up of hand using multipipette for placing DNA onto agarose gel.
    Close-up of scientist holding blood testing microtubes. — Stock Photo
    Close-up of scientist holding blood testing microtubes.
    Forensic scientist at scene of crime collecting DNA sample from knife as forensic evidence. — Stock Photo
    Forensic scientist at scene of crime collecting DNA sample from knife as forensic evidence.
    Female scientist examining DNA autoradiogram. — Stock Photo
    Female scientist examining DNA autoradiogram.
    Forensic scientist taking swab from blood-stained shirt as forensic evidence. — Stock Photo
    Forensic scientist taking swab from blood-stained shirt as forensic evidence.
    Gloved hand picking up sheet of agarose gel. — Stock Photo
    Gloved hand picking up sheet of agarose gel.
    Vial of potential drug in petri dish on DNA autoradiogram. — Stock Photo
    Vial of potential drug in petri dish on DNA autoradiogram.
    Female laboratory worker filling vials with pipette, close-up. — Stock Photo
    Female laboratory worker filling vials with pipette, close-up.
    Pipette adding sample to petri dish with DNA autoradiogram in background. — Stock Photo
    Pipette adding sample to petri dish with DNA autoradiogram in background.
    Pipette placing sample into test tube during experiment in laboratory. — Stock Photo
    Pipette placing sample into test tube during experiment in laboratory.
    Tools for gathering evidence at scene of crime. — Stock Photo
    Tools for gathering evidence at scene of crime.
    DNA swab on genetic test results. — Stock Photo
    DNA swab on genetic test results.
    Close-up of DNA autoradiogram on white background. — Stock Photo
    Close-up of DNA autoradiogram on white background.
    Forensic scientist taking swab from blood-stained shirt as forensic evidence. — Stock Photo
    Forensic scientist taking swab from blood-stained shirt as forensic evidence.
    Forensic scientist taking swab from blood-stained shirt as forensic evidence. — Stock Photo
    Forensic scientist taking swab from blood-stained shirt as forensic evidence.
    DNA samples, autoradiogram and forensic evidence bag on blue background. — Stock Photo
    DNA samples, autoradiogram and forensic evidence bag on blue background.
    Close-up of DNA autoradiograms on white background. — Stock Photo
    Close-up of DNA autoradiograms on white background.
    Close-up of DNA autoradiogram on white background. — Stock Photo
    Close-up of DNA autoradiogram on white background.
    Close-up of petri dishes and dropping pipette for genetic research. — Stock Photo
    Close-up of petri dishes and dropping pipette for genetic research.