Study: first successful test tube sperm

meiosis: cell division in which paired chromosomes exchange DNA and the number of chromosomes per cell is halved. The key to making these tissue fragments undergo this crucial step for ensuring genetic variation was to culture the tissue in  a serum that is often used to grow embryonic stem cells. The resulting sperm were injected into egg cells, which then produced healthy offspring via surrogate mothers.

The procedure is expected to have several significant impacts on the scientific community. Researchers are most hopeful about the procedure's possible application in producing healthy sperm for infertile men. Particularly, the method should aid males who are forced to undergo sterilizing cancer treatments before they reach puberty, and are thus unable to create a stock of sperm to use later in life for in-vitro fertilization. The procedure is also expected to help protect against the  extinction of endangered species.

Of course rigorous testing must be done before this procedure can be applied to humans. If the same methodology doesn't work in producing healthy human sperm, it could take another century before scientists discover an alternative solution. At least now researchers know that it is possible to cultivate sperm outside the body.

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It has taken nearly a century, but scientists have finally grown mammalian sperm outside the body. This discovery, which was published in the scientific journal Nature, is expected to provide a breakthrough in the treatment of male infertility.

Led by Takehiko Ogawa, researchers at the Yokohama City University took tissue fragments from the testes of mice and soaked them in various culturing solutions in the hope that these cells would divide into sperm cells. The team ran into problems with

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