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RGS family members are regulatory molecules that act as GTPase activating proteins (GAPs) for G α subunits of heterotrimeric G proteins. RGS proteins are able to deactivate G protein subunits of the G iα , G oα and G qα subtypes when testedin vitroandin vivo. Although the function of RGS proteins in cardiac physiology is unknown, their ability to deactivate...