G-protein

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Related to G proteins: GTPase, Second messengers

G-pro·tein

(jē′prō′tēn′, -tē-ĭn)
n.
Any of a class of cell membrane proteins that transmit signals from certain receptors to effector enzymes, enabling the cell to regulate its metabolism in response to hormones and other extracellular stimuli.

[From GTP-binding regulatory protein.]