这个词是什么意思？
An adenine nucleotide containing one phosphate group which is esterified to both the 3'- and 5'-positions of the sugar moiety. It is a second messenger and a key intracellular regulator, functioning as a mediator of activity for a number of hormones, including epinephrine, glucagon, and ACTH.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D000242 · MeSH 2026。
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