PHYSorg.com: PHYSorg news tagged with: toxic agent http://www.physorg.com/ en-us Physorg.com internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine. Too much of a good thing: Excessive DNA repair can lead to retinal degeneration (PhysOrg.com) -- A naturally occurring DNA repair system that normally protects cells from damage can cause retinal degeneration and blindness when overstimulated, according to a new study by MIT researchers. http://www.physorg.com/news150727857.html Medicine & Health Fri, 09 Jan 2009 12:50:57 EST news150727857