the effects of some organic calcium channel blockers and a toxin on synaptic transmission were examined in hippocampal slices from the guinea pig . omega-conotoxin fraction gvia , a novel peptide that blocks n and l type voltage-sensitive calcium channels , blocked synaptic transmission from mossy fibers to ca3 neurons at very low concentration ( 100 nm ) .
C0027793
synaptic transmission
C0027882
neurons