半胱氨酸 Cysteine
（重定向自Cystein）
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半胱氨酸（cysteine）属于20种天然氨基酸之一，是一种含硫（与甲硫氨酸一样）的非必需氨基酸。动物体内可经由蛋氨酸和丝氨酸合成。有缓解修复放射线对人体的损伤作用。在人体内还有范围广泛的解毒作用，是丙烯腈及芳香族酸中毒的治疗用药。
有助于戒除酒瘾，为脑部及肝脏作用时所需；对肝脏细胞的新生而言是必需品。
Cystein
中文百科
英语百科
Cysteine 半胱氨酸
（重定向自Cystein）
Cysteine (abbreviated as Cys or C) is a semi-essential proteinogenic amino acid with the formula HO2CCH(NH2)CH2SH>. It is encoded by the codons UGU and UGC. The thiol side chain in cysteine often participates in enzymatic reactions, as a nucleophile. The thiol is susceptible to oxidization to give the disulfide derivative cystine, which serves an important structural role in many proteins. When used as a food additive, it has the E number E920.
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