Human bodies have to be built from a single egg cell that's fertilized by a sperm cell. Many rounds of cell division occur as the body is developing, and it seems that there are plenty of chances for ...

Despite significant biomedical advances in recent decades, the very earliest events of human development¬--those that occur during a critical window just after fertilization--have remained an ...

When couples experience infertility, medical science presents possible solutions for a potentially successful conception of a baby. Infertility issues can be addressed with Human Chorionic ...

Some men produce too many sperms. That little-mentioned fact was the focus of my previous blog post. (See Why Too Many Sperms Spoil the Egg, posted on August 11, 2017.) With too many sperms, an ...

A stunning explosion of zinc fireworks occurs when a human egg is activated by a sperm enzyme, and the size of these 'sparks' is a direct measure of the quality of the egg and its ability to develop ...

Christopher Arellano Reyes majored in biology and minored in chemistry and biotechnology and was a 2022-23 health care ethics intern with the Markkula Center for Applied Ethics at Santa Clara ...

A young Black couple sits on a couch smiling, as the man lays his hand on the pregnant belly of his partner If you’re thinking about pregnancy, you’ve probably come across the term implantation in ...

Scientists based at The Rockefeller University have created an experimental system that models the implantation of a human embryo. The new system, an adaptation of one used to recapitulate the ...

For the first time, researchers have witnessed the exact moment conception occurs— and have recorded the ensuing explosion of sparks that form when sperm meets an egg. The Telegraph reported that ...

If you're thinking about pregnancy, you've probably come across the term implantation in your Googling. You may have heard folks mention implantation cramping or implantation bleeding, but maybe you ...