Replicative and repair DNA synthesis after solar damage.

It is possible to enhance the individually maximal spontaneous extent of unscheduled DNA synthesis after ultraviolet light damage in human skin by 40% using topical pretreatment with bifidus fraction compounds (7,8,9). This new and biological method of active radiation protection (4,5,7), has been shown to be unaffected by any artificially produced findings due to hydroxyurea, butyrates of misinterpreted thymidine labels from replicative SDS and repair UDS. The original experimental results could be reproduced also by others, even using completely different test methods. Obviously, the results are dependent on an appropriate topical compound allowing sufficient release and penetration.