Degradación de arginina y ornitina a) mamíferos H2N C NH2 H2O O COOH COOH COOH H2N C H H2N C H CH2 H2C NH C NH H2N H2N C H CH2 CH2 CH2 COOH H2N C H CH2 CH2 C O H2C NH2 H CH2 CH2 COOH b) microorganismos COOH H2O NH3 COOH H2N C H H2N C H CH2 CH2 CH2 CH2 Pi H2C NH C O H2N H2C NH C NH H2N COOH H2N C H CH2 CH2 O H2N C O P H2C NH2 Biosíntesis de treonina COOH H C NH2 CH2 COOH COOH H C NH2 CH2 C O O P COOH COOH COOH H C NH2 H C NH2 CH2 C O H H C NH2 CH2 HC OH CH2OH CH3