Monozygotic twinning itself after elective single embryo transfer is uncommon, occurring in no more than roughly 3% of cases.

The number of twins and triplets born can vary significantly between IVF clinics, new data shows, but experts warn that singleton pregnancies are the safest option.

cases and I.V.F. disputes, the frozen embryos vials like these will hold are increasingly caught The Embryo Question is a three-part series about the cluster of cells at the crossroads of science, ...

President Bush, saying he wanted to “proceed with great care,” announced in a national address on August 9 that he would allow federal funding of an existing 60 stem-cell lines but would not permit ...

Scientists are exploring ways to mimic the origins of human life without two fundamental components: sperm and egg. They are coaxing clusters of stem cells – programmable cells that can transform into ...