L-Cysteine is a non-essential (or semi-essential), neutral, genetically coded amino acid, derived from cystine and found in most proteins.是什么意思_L-Cysteine is a non-essential (or semi-essential), neutral, genetically coded amino acid, derived from cystine and found in most proteins.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句