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Where do the regulators of G protein signaling (RGS) bind to accelerate the GTPase activity of GPCR?

Where do the regulators of G protein signaling (RGS) bind to accelerate the GTPase activity of GPCR? Correct Answer G protein alpha subunit

A broad gene family has been identified whose members are G protein signalling (RGS) regulators. RGS proteins bind to the transition state of the GTP-activated G protein alpha-subunit and accelerate GTPase behavior.

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