CHANGING SKIN TO SPERM. “Scientists have turned skin tissue from infertile men into early-stage sperm cells in a groundbreaking study that raises hopes for new therapies for the condition. The unexpected success of the procedure has stunned some scientists, because it was thought to be impossible for the men to make any sperm.”
http://www.theguardian.com/science/2014/may/01/study-turns-skin-tissue-infertile-men-sperm-cells