Body, brain and hippocampus weights on postnatal (PN) days 4, 14, 21 and PN78. A) Reduced body weights were detected on PN21 that persisted to adulthood after termination of exposure and return of thyroid hormone status. B) Brain weight reductions were not seen on PN4 or PN14, but were revealed on (PN21) and persisted to PN78, but were restricted to the high dose group. C) Similarly, hippocampal weights were not evident on PN14 but were present on PN21 and PN78. Hippocampal weights were not taken in the PN4 neonate. Mean contrast test after significant effect of Treatment, Dunnett’s T-test, * p<0.05.