Endogenous substances and processes are those that originate from within a system such as an organism, tissue, or cell.[1]
Exogenous substances and processes contrast with endogenous ones, such as drugs, which originate from outside of the organism.
References[edit]
- ^ "Endogenous | Define Endogenous at Dictionary.com". Dictionary.reference.com. Retrieved 2011-07-11.
External links[edit]
The dictionary definition of endogeny at Wiktionary
