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

Scientists reveal one of nature’s strongest bonds When a sperm finally reaches an egg, its journey is far from over. Before a ...

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 ...

Egg fertilization is often described as an epic swim meet: Millions of sperm swim as fast as they can toward the egg until one — the fastest, strongest, healthiest sperm of them all — wins the race ...

Researchers have created human embryos by taking nuclei from ordinary skin cells, placing them into donated eggs, and ...

Sex cells made from scratch could revolutionize human reproduction. But researchers are struggling to translate promising ...

An innovative use of skin cells could provide a route for same-sex couples or women with fertility problems to have children ...

Sperm can live outside the body on the skin or other surfaces for 15 to 30 minutes. But, in other conditions, like a hot tub, ...

Groundbreaking research shows that as men age, harmful genetic mutations in sperm become more common—not just from random ...

The first mice to be created from two fathers, a phenomenon known as androgenesis, have now produced healthy offspring for the first time. Researchers implanted two sperm in an egg with its nucleus ...

Scientists created the eggs using DNA from adult skin cells, a step that could someday potentially lead to new ways to treat ...