In an advance for treating male infertility, researchers transplanted a patient with his own sperm-forming stem cells that ...

Known as the cell’s engine, the mitochondria propels the sperm toward the egg, explained Dr. Houda Amor, a co-author of the ...

One childless man’s journey through the sci-fi start-ups, DIY donor clubs, and group masturbation retreats attempting to save ...

It's commonly thought that sperm "race" to the egg, with the winner fertilizing it. But is this really the case?

Dr. Lee first points out sperm with "bad necks" that struggle to swim straight. Next, she identifies a sperm with a mix of abnormalities and warns that agglutination—when sperm cells stick ...

With only half the DNA, when the parent cell ... and sperm unite to make a fertilized egg, the chromosomes add up to equal 46. How exactly does meiosis mix and halve chromosomes? Find out through ...

Of course, we know now that it takes two to make a baby, and that it’s the sperm that determines a ... as if the semen's trapped and not all coming out, or if the volume is low.

It may seem unusual to discuss future fertility when a family is reeling from the diagnosis of a child’s cancer. But 85% of ...

Free radicals are unstable molecules that can damage DNA and cellular function and lead to cell death throughout the body, including the testes and sperm. “Any factor (genetic, immunological ...

WASHINGTON (AP) — A man who battled childhood cancer has received the first known transplant of sperm-producing stem cells ... 11 when a leg injury turned out to be bone cancer.