amplitude modulation article 14 controlled study 14 nonhuman 12 Animals 8 Rats 6 priority journal 6 rat 6 unclassified drug 6 Article 4 Calcium 4 Calcium Channels 4 Motor Neurons 4 Rats, Sprague-Dawley 4 animal experiment 4 animal tissue 4 calcium transport 4 calculation 4 chemistry 4 drug effects 4 electric potential 4 incubation time 4 mathematical analysis 4 metabolism 4 oscillation 4 ultraviolet radiation 4 2,2' bipyridine 2 2,2'-Dipyridyl 2 Acetylcholine 2 Action Potentials 2