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{{Short description|Substances & processes originating within an organism, tissue, or cell}} |
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{{For|endogeny or endogeneity in other contexts|Endogeneity (disambiguation){{!}}Endogeneity|Exogeny}} |
{{For|endogeny or endogeneity in other contexts|Endogeneity (disambiguation){{!}}Endogeneity|Exogeny}} |
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Endogenous substances and processes are those that originate from within a living system such as an [[organism]], [[Tissue (biology)|tissue]], or [[Cell (biology)|cell]].<ref>{{cite web|url=http://dictionary.reference.com/search?q=endogenous |title=Endogenous | Define Endogenous at Dictionary.com |publisher=Dictionary.reference.com |access-date=2011-07-11}}</ref> |
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In contrast, [[Exogeny#Biology|exogenous]] substances and processes are those that originate from outside of an organism. |
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For example, [[estradiol]] is an endogenous [[estrogen]] [[hormone]] produced within the body, whereas [[ethinylestradiol]] is an exogenous synthetic estrogen, commonly used in [[birth control pills]]. |
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==References== |
==References== |
Endogenous substances and processes are those that originate from within a living system such as an organism, tissue, or cell.[1]
In contrast, exogenous substances and processes are those that originate from outside of an organism.
For example, estradiol is an endogenous estrogen hormone produced within the body, whereas ethinylestradiol is an exogenous synthetic estrogen, commonly used in birth control pills.