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://thebrickes.shop/product-category/laundry-all-in-one/