nicotinic acetylcholine receptors ( achrs ) from muscle bind alpha-bungarotoxin ( alpha bgt ) and are composed of four kinds of subunits , whereas achrs from mammalian brains do not bind alpha bgt and are composed of two kinds of subunits . alpha bgt-binding proteins whose function is unknown are also found in brain .
C0034830
nicotinic acetylcholine receptors
C0034792
achrs