Fig. 3: KCNA1 and GPC1 were localized in human placenta villi.

Immunohistochemistry was performed on paraffin sections of human placenta villi (a, b) at early gestation and preeclamptic placenta at term placenta (cāf). At early pregnancy, the positive immunoreactivity for KCNA1 was mainly located in various trophoblast cells, including cytotrophoblast cells and syncytiotrophoblast cells (a), while GPC1 was predominantly observed in vascular endothelial cells (b). At term placenta, KCNA1 remained in various trophoblast cells (cāe), while GPC1 mainly located in vascular endothelial cells (dāf). CTB cytotrophoblast cells, EVT extravillous trophoblast cells, EC vascular endothelial cells.