omega conotoxin GVIA nonhuman 24 omega agatoxin IVA 24 Animals 22 Calcium Channel Blockers 22 article 22 controlled study 22 priority journal 22 animal tissue 20 calcium channel blocking agent 18 Animals, Newborn 14 Neuromuscular Junction 14 Rats 14 Synaptic Transmission 14 calcium channel 14 calcium channel N type 14 calcium channel P type 14 calcium ion 14 calcium transport 14 neuromuscular synapse 14 newborn 14 nitrendipine 14 omega-Agatoxin IVA 14 omega-Conotoxin GVIA 14 rat 14 Calcium Channels 12 Calcium channels 12 Muscle, Skeletal 12 Neurotransmitter Agents 12 drug effect 12