这个词是什么意思？
Biologically active molecules which are covalently bound to the enzymes or binding proteins normally acting on them. Binding occurs due to activation of the label by ultraviolet light. These labels are used primarily to identify binding sites on proteins.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D019920 · MeSH 2026。
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