这个词是什么意思？
Chemical substances having a specific regulatory effect on the activity of a certain organ or organs. The term was originally applied to substances secreted by various ENDOCRINE GLANDS and transported in the bloodstream to the target organs. It is sometimes extended to include those substances that are not produced by the endocrine glands but that have similar effects.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D006728 · MeSH 2026。
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