Once a sperm has broken through to an egg cell in order to fertilize it, the two cells need to hold together tightly. This ...

An international team of researchers has discovered a fundamental protein in human fertilization, called MAIA, which could lead to an improved understanding of infertility. For fertilization to be ...

It's a commonly held belief: Sperm cells are like runners in an epic race, competing against each other for access to the coveted egg at the finish line. The egg, in turn, waits patiently for the ...

How a sperm and an egg fuse together has long been a mystery. New research by scientists in Austria provides tantalizing clues, showing fertilization works like a lock and key across the animal ...

SAN FRANCISCO -- A cellular signaling system that responds to THC, the active substance in marijuana, as well as to anandamide, a cannabinoid-like molecule normally produced in the body, may regulate ...

June 21 (UPI) --For every animal, sperm perform the same function -- egg fertilization. Yet sperm size varies dramatically from species to species. Most studies on the topic have focused on how sperm ...

Researchers at Oregon Health & Science University (OHSU) have developed a remarkable new way for making human body cells ...

Fewer than 4 in 100 men who apply to be sperm donors reach the end of the process and have samples frozen and released for treatments, according to a new study. The journey of the egg and the embryo ...

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 ...

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 ...

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 tale” rooted in ...