cysteineyoudaoicibaDictYouDict[cysteine 词源字典]
"A sulphur-containing amino acid which occurs in keratins and other proteins, often in the form of cystine, and is a constituent of many enzymes", Late 19th century: from cystine + -eine (variant of -ine4).[cysteine etymology, cysteine origin, 英语词源]