Mammalian 'regulators of G protein signaling' (RGS proteins) help shut
off G-protein-mediated signaling by GTPase activation, But new eviden
ce shows that RGS proteins can also speed up the activation of signali
ng. The combined effect is a change in signaling kinetics without a de
crease in signaling intensity. (C) Current Biology Ltd ISSN 0960-9822.