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cysteine
[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
-ine
4
).
[cysteine etymology, cysteine origin, 英语词源]