Relative density of cells in primary somatosensory cortex of P50 offspring. Cell density was derived by dividing the total number of cells measured under high (20X) magnification by the thickness of the total, infragranular, or supragranular cortex measured under low (5X) magnification normalized to the thickness of the same compartment in SAL animals; i.e., Density = Cell Count / (Thickness[Prenatal Treatment]/ Thickness[SAL]). There was a significant main effect of prenatal treatment evident only in the infragranular compartment on P50 (F(9,80) = 2.32; p<0.05) * Newman-Keuls test, p<0.05 vs. SPF40 and SAL.