Medical Dictionary

G protein

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noun \ˈjē-\

Medical Definition of G protein

  1. :  any of a class of cell membrane proteins that are coupled to cell surface receptors and upon stimulation of the receptor by an extracellular molecule (as a hormone or neurotransmitter) bind to GTP to form an active complex which mediates an intracellular event (as activation of adenylate cyclase)


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