Nayernia of Newcastle makes (mouse) sperm from stem cells; fertilizes eggs

Newly acquired Professor Karim Nayernia of Newcastle produced mouse sperm-like cells from stem cells, fertilized (mouse) eggs AND PRODUCED LIVE OFFSPRING and said: "This knowledge could be translated into treatments for men whose sperm is dysfunctional." The findings are published July 11, 2006 in the journal Developmental Cell.

Previously, others had gotten as far as injecting such stem-cell derived cells into eggs and producing early embryos. But nobody else had reported live births.
[Look here.]