on·co·pro·tein | \ ˌäŋ-kō-ˈprō-ˌtēn, ˌän-, -ˈprōt-ē-ən 
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\Medical Definition of oncoprotein
: a protein that is coded for by a viral oncogene which has been integrated into the genome of a eukaryotic cell and that is involved in the regulation or synthesis of proteins linked to tumorigenic cell growth
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