In contrast, P-gp staining intensity in the syncytiotrophoblast was significantly lower in the PTDC compared to PTD group (p = 0.019, Fig. 4C), with no difference in the villous core intensity (PTD = 0.53 ± 0.11; PTDC = 0.44 ± 0.06). The gene discussed is PGP; the disease is Bjornstad syndrome.