This page explains the role of second messengers in cellular signaling, highlighting their importance in transmitting signals from cell receptors to target sites. It identifies the main classes of sec...This page explains the role of second messengers in cellular signaling, highlighting their importance in transmitting signals from cell receptors to target sites. It identifies the main classes of second messengers: cyclic nucleotides, inositol trisphosphate, diacylglycerol, and calcium ions.