PECAM1 and hydrops fetalis: The results showed that the number of CD31 positive endothelial cells were more than three times higher in the vehicle-treated ACLT group (36.15 ± 8.09/mm2) when compared with sham group (11.90 ± 4.99/mm2) and HF downregulated its value (16.16 ± 5.92/mm2) to a level comparable to sham group (Figures 4D,H).