article 8 controlled study 8 nonhuman 8 rat 8 acetylcholine 6 animal tissue 6 muscarinic M2 receptor 6 priority journal 6 Animals 4 Calcium channels 4 Motor nerve terminal 4 Rats 4 Rats, Sprague-Dawley 4 acetylcholine release 4 animal cell 4 animal experiment 4 calcium channel 4 calcium channel L type 4 calcium channel N type 4 calcium channel P type 4 calcium channel Q type 4 drug effect 4 methoctramine 4 muscarinic M4 receptor 4 neuromuscular synapse 4 pirenzepine 4 tropicamide 4 unclassified drug 4 1,1 dimethyl 4 diphenylacetoxypiperidinium iodide 2 5'-[β-thio] diphosphate trilithium salt 2