. "ITP can act as phosphate donor." . . . "Phosphoenolpyruvate carboxylase" . "PEP carboxykinase" . "PEPCK" . "Phosphoenolpyruvate carboxykinase" . "Phosphoenolpyruvate carboxykinase (GTP)" . "Phosphopyruvate carboxylase" . "GTP + oxaloacetate = GDP + phosphoenolpyruvate + CO(2)." .