A, transcriptional regulation; B, interacting proteins; C, post‐translational modifications; D, ligands, Ca2+ and calmodulin; E, membrane lipids; F, co‐assembly of subunits; G, forward trafficking, including packaging into COPII‐coated vescicles, transport to ER‐Golgi intermediate compartament and Golgi apparatus, and trafficking to specific membrane destinations into clathrin‐coated vescicles; H, internalization.