“…Potter concluded that area "A" was the most commonly affected. Embryonic area "B" was more extensive, including atresia of bladder and imperforate anus with atresia of the Davidson and Ross, 1954;Bain and Scott, 1960Potter, 1965Bergsma, 1979Potter, 1965Woolf and Allen, 1953Hilson, 1957Potter, 1965; Warkany , 197 1 ; Leonidas et al, 1982Saito et al, 1982Wright et al, 1981Potter, 1965Welch, 1958Potter, 1946Potter, 1965;Davidson and Ross, 1954;Kuhner et al, 1976;Potter, 1965Bergsma, 1979Potter, 1965Bergsma, 1979Potter, 1965Greenwood et al, 1976Hislop et al, 1979;Potter, 1965;Welch, 1958Bergsma, 1979Potter, 1965Potter, 1965Cote et al, 1978Yunis et al, 1980 aVentricular septal defect. hPatent ductus arteriosus.…”