PTGS2 and vitamin D deficiency: Maternal vitamin D deficiency has no effect on gene expression of Agtrb1 (F1,35 = 0.53, p = 0.82), Pgf (F1,35 = 0.40, p = 0.53), Hif1a (F1,35 = 0.90, p = 0.35), or Ptgs2 (F1,35 = 0.09, p = 0.93) (Figure 3) in placenta.