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a phosphoryl group to Phosphorylase b, converting it to Phosphorylase a, was named Phosphorylase Kinase. Years later, the first example of a kinase cascade was identified, whereby Protein Kinase A (PKA) phosphorylates Phosphorylase Kinase. At the same time, it was found that PKA inhibits glycogen synthase, which was the first example of a phosphorylation event that resulted in inhibition. In 1969, Lester Reed discovered that pyruvate dehydrogenase was inactivated

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