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 ...

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 ...

“This paper really marks the beginning of a new era for biomedical research,” Xiong Zhi-Qi, a researcher studying brain disease at the ION but who was not involved in the work, tells Nature. These ...