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    Researcher preparing samples of donated blood for analysis. — Stock Photo
    Researcher preparing samples of donated blood for analysis.
    Gloved hands of anonymous professional male repairman sawing metal detail with hacksaw during work in factory — Stock Photo
    Gloved hands of anonymous professional male repairman sawing metal detail with hacksaw during work in factory
    Close-up of stethoscope in male surgeon hand. — Stock Photo
    Close-up of stethoscope in male surgeon hand.
    Gloved hand holding blood sample in test tube. — Stock Photo
    Gloved hand holding blood sample in test tube.
    Scientist hand holding blood drop sample on microscope slide, studio shot. — Stock Photo
    Scientist hand holding blood drop sample on microscope slide, studio shot.
    Scientist hand sampling water in flask for quality testing. — Stock Photo
    Scientist hand sampling water in flask for quality testing.
    Cropped view of lab technician carrying cell-based testing kit in bioengineering laboratory. — Stock Photo
    Cropped view of lab technician carrying cell-based testing kit in bioengineering laboratory.