The simulations were conducted for muscle nicotinic acetylcholine receptors
with two non-equivalent sites and two conformational states, B (closed ion channel, low afinity) and A (open ion
channel, high affinity) . All calculations were based on a ligand concentration of 2 x 10-5 M. For the species
with one molecule of agonist bound to the high affinity site "H" the individual dwell time profiles above
are presented for binding of a second molecule, with single binding events prolonged by incresing numbers of passages
between B2 and A2.