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G-protein couple serpentine receptorso in the absence of ligand, what are the players doing - or not?o when ligand binds to the receptor, how does this trigger the activation of the twocomponents of the tripartite G-proteins?o what role does -arrestin play in the turn-off of the receptor?o how does the norepinephrine path molecularly modify the heart's beat - makecontractions occur faster?

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