Hormone (source code)
= Hormone
{wiki}
A <hormone> is a chemical messenger released by <biological cells> that regulates target <biological cells> bearing suitable <receptors>. In endocrine signaling, <hormones> travel to distant targets through the bloodstream. The extract-transfer experiment under <second messenger> isolates part of this <signal transduction> from intact <biological cells>. https://openstax.org/books/biology-2e/pages/9-1-signaling-molecules-and-cellular-receptors[Clark, Douglas and Choi, Biology 2e, 9.1: hormonal signaling]{ref}
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