Comparison between E21 and P0 cytokine response. mRNA levels of IL-1β (A), IL-10 (B), TNF-α (C) and IL-6 (D) are presented relative to the geomean of measured housekeeping genes. mRNA levels of housekeeping genes from control animals at E21 and P0 (left panel) and housekeeping mRNA levels at P0 in all groups (right panel) (E). **p < 0.01 and ***p < 0.001 indicate significant differences between groups. Data shown as mean + SEM.