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Infertility is fairly common. It affects around 15% of couples, with a third of the cases tracing back to the male.​ Now China, a country that for many decades had a strict limit on human reproduction, may be entering the business of artificial sperm. Chinese scientists have successfully engineered healthy mouse offspring by injecting their laboratory-made sperm cells into eggs, alleging that this could be a groundbreaking treatment for male infertility.

Not an actual picture of the discovery, but an apt visual metaphor.
Not an actual picture of the discovery, but an apt visual metaphor.
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The Daily Mirror reports that the scientists first exposed stem cells from a mouse embryo to a concoction of various chemicals, which became primordial germ cells. They then triggered the germ cells to imitate the testes' environment by exposing them to testicular cells and testosterone. The resultant spermatids (sperms without tails or swimming skills) were found to develop normally when injected into mouse eggs.

Sources: The Daily Mirror