Men have a source of potentially life-saving stem cells between their legs:

A team of American researchers has found a way to easily identify stem cells in the testicles of adult mice that can be coaxed to turn into brain cells, muscle cells, heart cells, blood cells and even blood vessels.

One day, they say, male patients may be able to turn to their own testicles as a source of stem cells to repair an ailing heart or kidney or to fix the brain damage caused by Alzheimer’s or Parkinson’s disease.

The procedure would involve removing a small piece of testicle – about the same amount used for a biopsy.

The first question that comes to my mind is, “Can you repair the damage you did to my testicle?” They don’t answer that question in the article. I presume the answer is yes, but I’d want to make sure before I authorized a major overhaul of my other body parts. I’d hate to have the rest of my body in full working order and then find they had scrapped out my testicles in the process.