Deletions in this region are associated with inability to produce sperm.

The gametophytes produce sperm and eggs to create new sporophytes.

An hour of using a laptop in that position generated enough heat to impair the body's ability to produce healthy sperm.

Why it's used: when a man can't produce sperm - for example, after a vasectomy or failed reversal.

In men, it helps stimulate healthy testes to produce sperm.

The testicles continue to produce sperm at a rate of about 50,000 cells per minute.

When sexually mature, each animal produces both sperm and eggs at the same time.

Once the testicles begin to grow they also develop their adult function - producing sperm.

Because the man cannot produce sperm or testosterone, it has a big effect on the man's life.