Silver nanoparticles stop sperm stem cell growth.
http://www.environmentalhealthnews.org/ehs/newscience/silver-nanoparticles-impair-sperm-stem-cell-signals/
"A new study has identified exactly how silver nanoparticles cause male reproductive cells to stop growing."
http://www.environmentalhealthnews.org/ehs/newscience/silver-nanoparticles-impair-sperm-stem-cell-signals/
"A new study has identified exactly how silver nanoparticles cause male reproductive cells to stop growing."