. "L-histidine and L-tyrosine can act instead of L-phenylalanine; in the reverse reaction, L-methionine, L-serine and L-glutamine can replace L-alanine." . . . "Phenylalanine(histidine) transaminase" . "Phenylalanine(histidine) aminotransferase" . "L-phenylalanine + pyruvate = phenylpyruvate + L-alanine." .