We have investigated the cell-specific effect of serotonin (5-HT) on regenerating neurons within the adult central nervous system of the pond snail, Helisoma trivolvis. In culture, 5-HT arrests outgrowth of buccal neurons B19 but not neurons B5 (Haydon, McCobb, and Kater, 1984). After axotomy, neurons within the Helisoma nervous system typically exhibit… (More)
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