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| Section2 = | Section3 = }} Ovothiol A (''N1''-methyl-4-mercaptohistidine) is a highly reducing antioxidant mercaptohistidine, which accumulates to very high levels in the eggs of certain marine invertebrates, including sea urchins, scallops and starfish, where it acts to scavenge hydrogen peroxide released during fertilization. This thiol is also found in some human pathogens including trypanosomes and members of the genus ''Leishmania''. It is synthesized by the addition and oxidation of cysteine to histidine by 5-histidylcysteine sulfoxide synthase, followed by methylation and further reduction. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ovothiol A」の詳細全文を読む スポンサード リンク
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