Gustavii B, Edvall H, Mineur A, Heim S, Mandahl N, Kristoffersson U, Mitelman F
Acta Obstet Gynecol Scand. 1985;64(8):661-2. doi: 10.3109/00016348509158209.
Chorionic villi were obtained by a direct vision technique. Villi without vessels (38 cases) failed to grow in vitro, irrespective of the amount of tissue. Vascular villi with an estimated weight exceeding 5 mg (71 cases) grew in vitro--with two exceptions.