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有一些读者、来信问:“听说,废毛发可以生产胱氨酸,是真的吗?” 我们回答:“是真的。” 又问:“废毛发生产胱氨
Some readers asked me: “I heard that waste hair can produce cystine, is that true?” We replied: “It’s true.” And asked: "The waste hair produces cystamine