In the Nov. 1, 2004, issue of the Proceedings of the National Academy of Sciences, a team led by Ralph Brinster at the University of Pennsylvania managed to grow mouse "spermatagonial stem cells" in a dish. Also known as SSCs, they are the type of stem cells that eventually become sperm.
Read the 'Science Makes Sex Obsolete' article:
personally, I prefer the human touch to spermatagonial cells in a dish... there's more emphasis on the build-up...the talk, the red wine, the cheeky glance, and the caress - beat that, cells in a dish!
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