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

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

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

Scientists have used an experimental approach to form ... egg, not a clone, and eggs carry half the chromosomes as nonreproductive cells in the body do. During fertilization, an egg's 23 chromosomes ...

More work needs to be done to create viable human embryos, but the method might someday be used in IVF to help infertile people and male couples.

Hormones and fertility are not the only requirements for a successful pregnancy. Energy within cells also has an important ...

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

The embryos weren’t used to try to establish a pregnancy, but the researchers behind the technique say it could one day be ...