1. Introduction: Cell signaling and signal transduction (1) Cell signaling (2) Types of cellular signals (3) Functions 2. Gap junction and diseases (1 Structure of gap junction (2)Function of gap junction (3)Related diseases 3. Receptor-Mediated Signal Transduction and diseases (1)Cell-surface receptors (2)Nuclear receptors B3)Regulatory mechanisms of signal transduction (4)Disorders and related diseases1. Introduction: Cell signaling and Signal transduction (1) Cell signaling (2) Types of cellular signals (3) Functions 2. Gap junction and diseases (1) Structure of gap junction (2) Function of gap junction (3) Related diseases 3. Receptor-Mediated Signal Transduction and diseases (1) Cell-surface receptors (2) Nuclear receptors (3) Regulatory mechanisms of signal transduction (4) Disorders and related diseases