1. An amino acid, C3H7O2NS, derived from cystine and found in most proteins. 
   半胱氨酸一种氨基酸，c3h7o2ns，从胱氨酸中提取，并存在于大多数蛋白质中
2. an amino acid containing sulfur that is found in most proteins; oxidizes on exposure to air to form cystine. 
   多数蛋白质中的含有硫的氨基酸，在空气中氧化后形成胱氨酸。

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