There's a diverse range of responses that might occur, but that response is initiated by this simple chemical process of a ligand binding to a receptor.

细胞对外界信号可能会发生不同的反应,但这些反应都源自,配体和受体结合这个简单的化学过程

耶鲁公开课 - 生物医学工程探索课程节选

It gets produced in response to a signal so there's a binding of a ligand to a receptor, the enzyme that does this conversion is activated and more cycle AMP is released.

这类分子的产生是对信号做出的一种反应,当配体和受体结合时,催化这种转化过程的酶被激活,更多的cAMP释放出来

耶鲁公开课 - 生物医学工程探索课程节选