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Average Z scores of mRNA expression of Th1- or Th2-type cytokines in placentas from different treatment and fetal-weight groups. Group I, placentas from fetuses from control dams; group II, placentas from P. gingivalis-challenged dams with all normal-weight fetuses; groups III and IV, placentas from NFW fetuses (group III) or FGR fetuses (group IV) from P. gingivalis-challenged dams with at least one FGR fetus in their litters.
