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Heme Oxygenases in Pregnancy II: HO‐2 is Downregulated in Human Pathologic Pregnancies

Problem:  We previously reported a diminished expression of the heme‐degrading enzymes heme oxygenases (HO)‐1 and HO‐2 in decidua and placenta from mice undergoing Th1‐mediated abortion, strongly indicating the protective effect of HO in murine pregnancy maintenance. Here we investigated whether the expression of HO‐1 and HO‐2 is also reduced at the feto‐maternal interface of pathologic human pregnancies.