Journal of Investigative Dermatology published an article in January 2009 with the results of the department of dermatology at the University of Lubeck in Germany and made available by the Zhejiang University in Hangzhou, China. Both are exploring the effects of excessive ultraviolet radiation (UV radiation) and found by UV radiation, one of the most damaging environmental influences on human skin. Observations were made using a human body model, a living human tissue interaction system under physiologically relevant conditions in situ than normal skin and hair would normally be. In conjunction with UVB light, one of two most common types of UV light, reduction of hair shaft elongation, premature catagen entry and reduces hair matrix keratinocyte proliferation irradiated the greatest losses were observed. Even if low or high amounts of radiation, apoptosis and necrotic cell death, either there was or was an absolutely dominant effect. Both University of investigators has concluded that UV radiation play a role in modifying complex hair growth cycle and may promote cell death and encourages regulatory events in human hair follicles in vitro. This data can be collected from the human body model encourages its use for the general study of UV-induced effects and for testing possible agents for UV-protection agents. We have in our A student in medicine, I take my studies and scientific evidence from medical experts and put them in writing for the general public. My writings are intended for educational purposes and for evaluation of medical professionals, but also meant to be read by the world.