Blastomeres biopsied from spare embryos ((A) Embryos diagnosed as genetically abnormal using current PCR- and FISH-protocols; (B) Embryos diagnosed as normal for the investigated region using current PCR- and FISH-protocols, but not of sufficient quality to be transferred or frozen; (C) Embryos of the sex that is selected against following PGD based sex-selection, or embryos of the sex that is selected for but of insufficient quality to be transferred or frozen; (D) Embryos that were not biopsied in a PGD cycle since they suffer a slight growth delay.) derived from following patient groups: