Hcrmone , n nutransmitt cell factors,growth factor from the extraceliular are called the first messenger cAMP, cGMP, W3,DAG,Cain cytoplasm are called the second messengers.
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- 胞外第一信使（包括激素、神經(jīng)遞質(zhì)、細胞因子、生長(cháng)因子等）與其特異受體結合后，被激活的受體通過(guò)刺激特定的效應酶或離子通道，而在胞漿內產(chǎn)生第二信使（包括cAMP，cGMP；IP_3，DAG；Ca~(2+)等）；
