(PEP) An important phosphorylated intermediate of glucose metabolism. In glycolysis PEP is the immediate precursor of pyruvic acid, while in the synthesis of glucose from acetyl-CoA, PEP is formed from oxaloacetate generated in the * glyoxylate cycle. In C 4 plants PEP is an intermediate in the Hatch-Slack pathway. The aromatic amino acids, and hence a large number of other aromatic nitrogenous compounds, are also synthesized from PEP.
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