Phenylephrine, vasopressin and the bivalent cation ionophore A23187 mobilized Ca2+ normally, but failed to activate phosphorylase, in hepatocytes from gsd/gsd rats with a deficiency of liver phosphorylase b kinase. These data provide strong evidence that phosphorylase b kinase is the site of action of the Ca2+ mobilized intracellularly during alpha 1-adrenergic activation of phosphorylase in liver cells.

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