Cover legend: The pond snail Lymnaea stagnalis can learn taste aversion and consolidate this learning into long-term memory called conditioned taste aversion (CTA). Some molluscan insulin-related peptides (MIPs) are up-regulated in snails exhibiting CTA, and when MIPs are applied to the isolated CNS, a longterm change in synaptic efficacy of the synaptic connection between a key interneuron for CTA and a buccal motor neuron occurs. This synaptic enhancement may be the neural correlate of behavioral CTA. For more information, see the article by Murakami et al. (pages 371–383).