By about 1900 the observations of Hertwig, Fol, and others were brought together to make the now-familiar picture: a single ...

In boys who, before starting puberty, undergo radical treatments that can affect their fertility, testicular tissue can be ...

They found that male medaka can mate 19 times per day on average. In the first three mating sessions, the medaka released ...

when a surge in testosterone triggers the production of an average of 200 million sperm each day. Sperm cells mature in the epididymis, a 20-foot-long series of thin, tightly coiled tubes.

A sperm cell and an egg cell each contain half the DNA to make a person. Encoded in that DNA are genes – instructions on how to make everything from eyelids to elbows. Some traits, like height ...

Female gametes are called ova or egg cells, and male gametes are called sperm. Gametes are haploid cells, and each cell carries only one copy of each chromosome. These reproductive cells are ...

This imbalance disrupted the normal progression of cell division, impairing the production and maturation of sperm cells. Oxidative stress emerged as another significant factor contributing to the ...

In fertile men, new sperm cells are constantly made in the testicles ... will decrease sperm production while preserving libido," she said. But bigger, longer trials were needed to check it ...

Loss of the Y chromosome (LOY) in men, a dynamic mutation linked to aging, impairs immune function and increases risks of ...

Sperm cell adaptations include ... Genetic modification can be used to produce plants that improve food production. For example, a plant may be produced with improved resistance to pests.

In a world premier, cryopreserved immature testicular tissue was reintroduced after 16 years in an infertile man who underwent chemotherapy in childhood. With this transplant, doctors and researchers ...