Assertion: ligand's receptor | /r/CapableOf | call seven-transmembrane
Facets:
Source sentences:
text: Except for the 5-HT 3 receptor, a ligand-gated ion channel, all other 5-HT receptors are G-protein-coupled receptors (also called seven-transmembrane, or heptahelical receptors) that activate an intracellular second messenger cascade.