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    Human blood cells, light micrograph. — Stock Photo
    Human blood cells, light micrograph.
    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.
    Human blood cells, light micrograph. — Stock Photo
    Human blood cells, light micrograph.
    Close-up of sample tubes in in vitro fertilisation lab. — Stock Photo
    Close-up of sample tubes in in vitro fertilisation lab.
    Blood cells, light micrograph. — Stock Photo
    Blood cells, light micrograph.
    Colored scanning electron micrograph of resting T-lymphocytes from human blood sample. — Stock Photo
    Colored scanning electron micrograph of resting T-lymphocytes from human blood sample.
    Laboratory scientist adding a small amount of solid reagent to a container on a scale — Stock Photo
    Laboratory scientist adding a small amount of solid reagent to a container on a scale
    Colored scanning electron micrograph of activated T lymphocyte from human blood sample. — Stock Photo
    Colored scanning electron micrograph of activated T lymphocyte from human blood sample.
    Researcher extracting blood from a vial — Stock Photo
    Researcher extracting blood from a vial
    Blood testing equipment — Stock Photo
    Blood testing equipment
    Blood cells, light micrograph. — Stock Photo
    Blood cells, light micrograph.
    Technician hand holding blood sample ready for testing in laboratory. — Stock Photo
    Technician hand holding blood sample ready for testing 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.