In the United States, more than 11% of men under the age of 49 are infertile. While the causes are varied and range from infections to hormonal imbalances, deformities during meiosis—a specialized ...

Unlike women, who are born with all the eggs they'll ever have, men can continue to produce sperm throughout their adult lives. To do so, they require a constant renewal of spermatogonial stem cells, ...

Researchers in Japan have uncovered key information about a protein that plays a crucial role in the process of sperm production, which could unlock doors for male contraception. Scientists from Osaka ...

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 ...

Scientists have discovered only a handful of genes responsible for stem cell self-renewal, a property that allows stem cells to continue giving rise to a variety of cell types during an organism's ...