Fig. 2

Immunohistochemical visualization of OXTR. a, b – placental samples (the image captured through optical microscope was subjected to series of digital transformations for morphometric purposes; initial magnification 400×); c – trophoblast cells in culture (phase –contrast image); d – trophoblast culture immunostained for OXTR (the image digitally transformed for morphometric purposes). The OXTR is represented by the category of blue hues ranged from dark blue to violet blue. Scale bar = 100 μm. CT – cytotrophoblast, ST – syncytiotrophoblast, fv – fetal vein, fa – fetal artery