Extracellular chemical stimuli transmit their signals to the cell interior by binding to receptors. A transducer passes the signal to an effector enzyme that generates a second menssenger. Signal-transduction pathways often include G proteins and protein kinases. The adenylyl cyclase signaling pathway leads to activation of the cAMP-dependent protein kinase A. The inositol-phospholipid signaling pathway generates two second messengers and leads to the activation of protein kinase C and an increase in the cytosolic Ca2+ concentration. In receptor tyrosine kinases, the kinase is part of the receptor protein.
Wat da fucking biochemistry. 
那天妳驚呼：「哇嗚！今天的天空好漂亮呀！」的時候，上述的過程亦在你多數細胞的磷酯雙層膜附近持續發生，像極了一群幫忙總烳師辦桌的歐巴桑，底臨時用紅白藍帆布搭建的灶腳，咶聲繁忙，進進出出。而後，妳我皆傻笑著說再會。後來的某天，我終於明白妳當初說：「人生還這麼長，拉出個兔子也沒甚麼了不起。」的真意了。
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