The nonessential amino acids are alanine, arginine, aspartic acid, cysteine, cystine, glutarnic acid, glycine, hydroxyproline, proline, serine, and tyrosine.

• 非必需氨基酸包括丙氨酸、精氨酸、天冬氨酸、半胱氨酸、胱氨酸、谷氨酸、甘氨酸、羟脯氨酸、脯氨酸、丝氨酸和酪氨酸。