CFTR and cystic fibrosis: Embryos 1, 2, 6, 9, and 10 were affected with congenital FVII deficiency; embryos 4 and 5 were compound heterozygotes for the two CFTR gene mutations; embryos 7 and 8 were diagnosed as carriers of congenital FVII deficiency and CF; and embryo 3 was a carrier of congenital FVII deficiency but did not harbour either of the CFTR gene mutations.