I could make all sorts of comment upon the following bit of news, but I shall refrain.

Human bone marrow has been used to create early-stage sperm cells for the first time, a scientific step forward that will help researchers understand more about how sperm cells are created.

The research published today (Friday, April 13 2007), in the academic journal Reproduction: Gamete Biology, was carried out in Germany by a team of scientists led by Professor Karim Nayernia, formerly of the University of Göttingen but now of the North-east England Stem Cell Institute (NESCI), based at the Centre for Life in Newcastle upon Tyne.