Comparison of BrdU-labeled cell counts in CL10 from unstimulated brains perfused with normal saline and saline containing 10−9M serotonin (first two columns), with in vivo controls (third column). Cell counts taken from in vivo controls contained significantly more labeled cells than those in the perfused brains, although no significant differences were found between the controls and the brains enriched with 5HT. (ANOVA, p = 0.01; Tukey, normal saline - serotonin, p = 0.097; normal saline - control, p = 0.009; serotonin - control, p = 0.494)