Abstract

Distribution of neurons immunopositive to antibody against the small peptides encoded by the Helix Command-Specific 2 (HCS2) gene in the central nervous system of juvenile Aplysia californica was investigated. The HCS2 gene is specifically expressed in the withdrawal behavior neurons of the terrestrial snail Helix lucorum. In Aplysia, 20–25 immunopositive neuronal somata were observed on dorsal surface of each pleural ganglion (including a giant pleural neuron). The HCS2-encoded peptide immunopositive fibers were observed in neuropiles of all ganglia and in many nerves. Functional significance of Aplysia immunopositive cells is discussed.

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