Sperm on order – from mice stem cells
producing viable sperm using the stem cells of mice
induce mice stem cells into creating sperm precursors, which were transplanted into infertile male mice. The mice then produced sperm that was successfully used to fertilize eggs in a lab dish.
The offspring were healthy and fertile,
There are many difficult issues ahead in applying this to humans. But it is a first step in a long long way ahead.