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    Close-up of human blood and various hiv samples in test tubes while screening in medical lab. — Stock Photo
    Close-up of human blood and various hiv samples in test tubes while screening in medical lab.
    Blood samples in test tubes — Stock Photo
    Blood samples in test tubes
    Tube with blood sample on metal tray in laboratory, close-up. — Stock Photo
    Tube with blood sample on metal tray in laboratory, close-up.
    Female scientist holding blood sample by microscope in laboratory. — Stock Photo
    Female scientist holding blood sample by microscope in laboratory.
    Researcher hand selecting labelled test tubes with blood samples. — Stock Photo
    Researcher hand selecting labelled test tubes with blood samples.
    Single test tube with blood sample in rack. — Stock Photo
    Single test tube with blood sample in rack.
    Scientist examining specimen under microscope during clinical trial in laboratory. — Stock Photo
    Scientist examining specimen under microscope during clinical trial in laboratory.
    Blood samples in centrifuge tubes on white background. — Stock Photo
    Blood samples in centrifuge tubes on white background.
    Blood samples in test tubes — Stock Photo
    Blood samples in test tubes
    Scientists viewing sample on glass slide under light microscope. — Stock Photo
    Scientists viewing sample on glass slide under light microscope.
    Doctor reading the results of blood test while holding blood sample. — Stock Photo
    Doctor reading the results of blood test while holding blood sample.
    Pool of blood in watch glass with syringe. — Stock Photo
    Pool of blood in watch glass with syringe.
    Tube with blood sample on metal tray in laboratory, close-up. — Stock Photo
    Tube with blood sample on metal tray in laboratory, close-up.
    Close-up of syringe full of blood in hands of male doctor. — Stock Photo
    Close-up of syringe full of blood in hands of male doctor.
    Labelled vacutainer tubes containing blood samples, close-up. — Stock Photo
    Labelled vacutainer tubes containing blood samples, close-up.
    Scientists viewing sample on glass slide under light microscope. — Stock Photo
    Scientists viewing sample on glass slide under light microscope.
    Rack of test tubes with blood samples on blue background. — Stock Photo
    Rack of test tubes with blood samples on blue background.
    Rack of test tubes with blood samples in laboratory. — Stock Photo
    Rack of test tubes with blood samples in laboratory.
    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.
    Tube with blood sample on metal tray in laboratory. — Stock Photo
    Tube with blood sample on metal tray in laboratory.
    Close-up of laboratory technician holding tube with blood sample in gloved hand. — Stock Photo
    Close-up of laboratory technician holding tube with blood sample in gloved hand.
    Blood samples in a multi well plate during a clinical trial. — Stock Photo
    Blood samples in a multi well plate during a clinical trial.