These cells, found in the testicles even before puberty, typically mature into sperm when testosterone levels rise during adolescence. But medical conditions — like a blockage in the reproductive ...

SARS-CoV-2 infection is linked to significant declines in sperm quality, including reduced sperm count, motility, and ...

The term “germline” is due to the mutations being present in eggs and sperm which are called “germ cells.” These mutations are in all cells of the body and remain throughout life.

No sperm cells have been detected in his semen yet ... some of the transplanted stem cells could have cancer-causing genetic mutations that could eventually develop into new tumors, Houman ...

In the August 1 Science, Anne Goriely and colleagues at the Weatherall Institute of Molecular Medicine report that a mutation at this site is selected for because it confers an advantage to the ...

Kanazawa University and colleagues have achieved a breakthrough in understanding sperm DNA packaging. Using high-speed atomic ...

50% of sperm cells have one X chromosome and 50 ... in the structure of a gene or in the number of chromosomes in a cell. Mutations can occur naturally before a cell divides. They can also be ...

A sperm cell and an egg cell each contain half the ... If one of a woman’s X chromosomes has the hemophilia mutation, she has a backup and will avoid most of the symptoms. But if she passes ...

His parents enrolled him in a study that was collecting and storing immature testicular tissue, and the sperm-forming stem cells in them, from young patients with the goal of eventually giving ...

A man in his early 20s received a transplant of his own sperm-producing stem cells, which had been frozen since his childhood, in an attempt to regain fertility. Doctors are waiting to see if the ...