A blood smear sample is shown at 50x magnification through the oculus of a microscope at Barksdale Air Force Base, La., Jan. 26, 2016. Laboratory technicians added dye to blood cells to make samples more visible under microscopes. ( Air Force photo/Airman 1st Class Mozer O. Da Cunha)


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Keywords: blood, exams, hospital, lab, laboratory, medical, medicine, science, technician, tests