An experimental treatment significantly improves the quality of human eggs and increases the proportion that can be used for ...

New Haven, Conn. — In a common metaphor used to describe human fertilization, sperm cells are competitors racing to penetrate a passive egg. But as critics have noted, the description is also a “fairy ...

Roughly 50 years ago, scientists pursued a line of inquiry about the creation and development of human embryos in the lab. As of now, the extent of this research is limited to the first 14 days ...