attachment

Scientists Discover What Makes Human Embryo Attach to Uterus

A UCSF-led research team has identified the first molecular step that allows a week-old human embryo to attach to the uterus. The finding is expected to provide a new tool to diagnose and treat infertility and early pregnancy loss, the scientists report.

The researchers found convincing evidence that a molecular sticking process stops the embryo's journey along the uterine wall and starts attaching it to the wall -- the first stage of implantation. Failure of the embryo to implant causes about three-fourths of lost pregnancies.