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Although the method now works just for mice, it may well apply to human cells, since they use the same genetic signals as mouse cells.
Cultivation of the sperm production cells has been a 10-year goal of Dr. Ralph L. Brinster, a reproductive biologist at the University of Pennsylvania School of Veterinary Medicine. The ability to culture the cells is a first step that leads in a number of possible directions. One is correcting the sperm of infertile men. Another, if ethically acceptable, would be genetic engineering in humans. A third is generating embryonic stem cells without the controversial step of making an embryo.
The new method was developed by Dr. Brinster and his colleagues Hiroshi Kubota...