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What Does In Vivo Mean?

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Updated April 17, 2014

Definition:

In vivo refers to a medical test, experiment or procedure that is done on a living organism, such as a laboratory animal or human.

A study done in vivo looks at how the body responds to a particular substance, in contrast to in vitro studies that are done in a test tube or laboratory dish.

Examples:
New chemotherapy drugs for lung cancer are usually studied in vitro, before they are studied in vivo in clinical trials on humans.
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