four mouse monoclonal antibodies ( mabs ) were shown by immunoblotting procedures to recognize the major , basic , membrane-bound mr 43,000 protein ( 43k protein ) of acetylcholine receptor-rich postsynaptic membranes from torpedo nobiliana . these mabs and a mab against an extracellular determinant on the acetylcholine receptor were used to localize the two proteins in electroplax ( torpedo californica ) and on unsealed postsynaptic membrane fragments at the ultrastructural level .
C0025252
membrane
C0033684
proteins