Unimplanted blastocysts were recovered from the Lifr flx/D : Ltf Cre/+ uteri and , when transferred to wild-type recipients , implanted normally , indicating that uterine receptivity rather than the embryo 's competency is compromised .
O O O O O O B-GeneOrGeneProduct O O B-GeneOrGeneProduct O O O O O O O O O O O O O O O O O O O O O O O O O O