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Definition of In vivo

In vivo: In the living organism. For example, an experiment that is done in vivo is done in the body of a living organism as opposed to in a laboratory method that does not use the living organism as the host of the test. In vivo is the opposite of in vitro.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=4034
Last Editorial Review: 3/19/2012

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