Implantation happens when the fertilized egg, called a blastocyst, aligns, attaches, and embeds into the uterine lining (endometrium). Implantation is a complex process that involves three key ...

When the blastocyst attaches to the uterine wall, some people experience a bit of light spotting. This "implantation bleeding" usually shows up around the time you'd expect your menstrual period.

In a study of early embryonic development in primates, an international research team under the leadership of Berthold ...

Approximately five days post fertilization (dpf), the blastocyst develops. The inner cell mass gives rise to the fetus, while the surrounding trophectoderm transforms into the placenta. After ...