精氨酸Arginine- Glycine甘氨酸 Amidinotransferase 鸟氨酸Omnithine Guanidinoacetate胍乙酸 Methionine ATP S-Adenosylmethionine (SAM) Guanidinoacetate 甲硫氨酸 methyltransferase (GAMT) Adenosylhomocysteine Creatine 0、 +ADP N -CH2-C-0 肌酸激酶 +NH CP的组成 磷酸t酸 H-N-H-G-N-CH2-C-0 +ATF N"H2 肌酸