The syncytiotrophoblast (STB) that forms the epithelial covering of the placental villous tree has a unique cell biology on account of its syncytial nature. The tissue is in a terminally-differentiated. postmitotic state. and expands through the recruitment by fusion of underlying progenitor cytotrophoblast cells. https://www.markbroyard.com/hot-save-turbo-air-m3f24-1-n-29-wide-m3-series-reach-in-freezer-featuring-one-solid-door-energy-star-on-sale-top-super/