
Keywords: nitric oxide; NO; learning; mollusks; synaptic plasticity; identified neuronsANOVA, analysis of variance; EPSP, excitatory postsynaptic potential; HEPES, 2-[4-(2-hydroxyethyl)piperazin-1-yl]ethanesulfonic acid; L-NNA, N-omega-nitro-L-arginin; LTF, long-te