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Quelles sont les 2 propositions exactes ?Concernant la communication cellulaire :A. L'interaction d'une protéine G hétérotrimérique avec son récepteur à 7 domaines transmembranaires activé permet la phosphorylation de la protéine G sur la sous-unité alpha.B. L'AMPc est un second messager capable d'activer la protéine kinase A.C. La voie de signalisation des arrestines ne fait pas intervenir une protéine G hétérotrimérique.D. L'activation d'une protéine G hétérotrimérique est provoquée par l'augmentation de la concentration en seconds messagers.
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