Biology - College Biology - Cellular - Cell signaling pathways - How Cells Communicate

5-step signal transduction pathway. Step 1: 'SIGNAL - A ligand (hormone, growth factor, neurotransmitter) is released by one cell and travels to target cell. Types: endocrine (blood), paracrine (nearby), autocrine (self), juxtacrine (direct contact).' Step 2: 'RECEPTION - Ligand binds to specific RE