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Measured after swim, BTBR mice have significantly more 5-HT neurons with activated expression of Fos. The largest magnitude and most statistically significant effects occurring in the MR and caudal ventral part of the DR. 5-HT neurons here identified by immunolabeling for TPH. **P < 0.0005. Significant increases are also detected caudal dorsal and in middle levels both dorsal and ventral (*P < 0.05). N = 16–19 per group.
