Moreover, they subsequently identified the same structure within the sperm cells of zebrafish and in mouse oocytes and sperm. Their findings were published today in Science. This has implications for ...

When a woman becomes pregnant, the outcome of that pregnancy depends on many things — including a crucial event that happened ...

Who hasn't seen it before: the view through the microscope in which a sperm penetrates an egg cell and fertilizes it. This fundamental step in procreation happens dynamically and seemingly without ...

Xenopus is a type of frog that is commonly used as a model organism in biological research, and their eggs develop outside of the body, making them especially good for studying development.