“…Using the criteria defined by Opitz in the original papers [Opitz et al, 1969a,bl, we have collected in the literature 33 families with G syndrome [Opitz et al, 1969a;Coburn, 1970;Little and Opitz, 1971;Gilbert et al, 1972;Kasner et al, 1974;Van Biervliet and Van Hemel, 1974;Frias and Rosenbloom, 1975;Pedersen et al, 1976;Dodero et al, 1977;Miller et al, 1977;Cordero and Holmes, 1978;Funderburk and Stewart, 1978;Greenberg and Schraufnagel, 1979;Arya et al, 1980;Cote et al, 1981;Kien et al, 1981;Sauer and Hollwarth, 1981;Farndon and Donnai, 1983;Chemke et al, 1984;Somer and Westerlund, 1984;Bolsin and Gillbe, 1985;Einfeld et al, 1987;Neri et al, 1987;Tolmie et al, 1987;Williams and Frias, 19871. Furthermore, we ascertained 18 families with BBB syndrome [Christian et al, 1969;Opitz et al, 196910;Michaelis and Mortier, 1972;Reed et al, 1975;Cordero and Holmes, 1978;Gonzalez et al, 1978;Funderburk and Stewart, 1978;Biasin et al, 1980;Da Silva, 1983;Halal and Farsky, 1981;Stoll et al, 19851. Most of these cases were reviewed by Funderburk and Stewart [ 19781 who delineated the differential diagnosis between the two syndromes.…”