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doctor holding a test tube of blood and writing on a form
extreme closeup of test tube of blood taken for a blood test
Medical clinic. Nurse holding an test tube filled with blood. Close up
Medical clinic. Nurse holding an test tube with blood sample. Close up
The doctor holds a tube with blood in hand
Little doctor holding tube for chemicals. Young boy as future doctor working with chemical test tube in slow motion.
A woman holding a closed tube of blood
vintage 1930 nurse handing the doctor a blood sample in a test tube
Portrait of a test tube with blood
Respectable gray-haired doctor-mentor holding in his hands test tube with chemical solution and comparing with test tube of female doctor-intern while another interns watching
The hand shakes a test tube with blood
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