title: Is there a common design for cell membrane channels?
mesh_terms: D000818:Animals; D007473:Ion Channels / Q000502:physiology / Q000648:ultrastructure*; D008954:Models, Biological; D011487:Protein Conformation; D011950:Receptors, Cholinergic / Q000378:metabolism
chemical_list: D007473:Ion Channels; D011950:Receptors, Cholinergic