Human reproduction requires both male and female gametes. Gametes are special sex cells that contain the genetic information necessary to create a new life. Men produce millions of gametes called ...

Researchers at Newcastle University in England report they have coaxed the first human sperm cells from embryonic stem cells, in a remarkable demonstration of how quickly the field of stem-cell ...

When considering how sperm move, the word "swimmers" comes to mind. The classic microscopic image is of a tiny cell swishing its tail from side to side as it propels forward. A new 3D model upends ...

DALLAS – Nov. 15, 2005 – New experiments that prevented rat sperm stem cells from changing permanently into sperm have brought researchers one step closer to coaxing such cells to behave like ...

Sperm is a reproductive cell created in the testicles. Males produce millions of these cells each day, but it takes only one sperm to fertilize an egg. This article outlines what sperm are, where they ...