Scientist viewing a sample on a glass slide before putting it under a light microscope.

Glass slide containing a human sample under a light microscope for medical testing.

Scientists preparing a human blood sample for analysis under a light microscope.

Medical screening. Scientist examining a glass slide containing a human sample under a microscope.

Close-up of a scientist placing a slide containing a human sample under a light microscope for medical testing.

Close-up of a scientist placing a slide containing a human sample under a light microscope for medical testing.

MODEL RELEASED. Scientist viewing a sample down a light microscope with a molecular model to illustrate research.

MODEL RELEASED. Scientist viewing a sample down a light microscope with a molecular model to illustrate research.

Scientist examining specimens under a microscope during a clinical trial in the laboratory.

MODEL RELEASED. Laboratory researcher using a light microscope to examine stem cells in a culture jar. At right are a pipette, samples and DNA (deoxyribonucleic acid) helix to illustrate genetic editing and research.

Medical screening

Close up of scientists hand holding blood sample on a glass microscope slide for medical testing

Biological research

Biological research

Female scientist about to view a sample under a microscope

Scientist using a light microscope

Female scientist about to view a human sample under a microscope

Doctor preparing to view blood sample under microscope in laboratory for medical testing

Clinical testing

Chemist examining a sample slide on a microscope.

Chemist placing a sample slide on a microscope stage.

Scientist preparing a sample slide containing a human blood specimen to view under a microscope in laboratory for medical testing

Scientist preparing a sample slide containing a human specimen to view under a microscope in laboratory for medical testing

Scientists viewing a biological sample on a glass slide under a light microscope.