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Definition Page for DrumLib's Health Research Review:
Exogenous (eks-OJ-e-nus)
Originating or produced outside the body, cell, or organ. The
opposite of endogenous. Example: The testosterone that a bodybuilder injects is called exogenous
testosterone. The testosterone that the body produces is called endogenous testosterone.
Extracellular (eks-tra-SELL-you-lar)
Outside the cell.