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. 2006 Sep 5;103(37):13765–13770. doi: 10.1073/pnas.0604213103

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© 2006 by The National Academy of Sciences of the USA

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Fig. 5. — Persistence of thymine-thymine cyclobutane dimers within human skin exposed to UVA (100 J/cm²) or UVB (0.1 J/cm²) radiation. Repair of TT (6-4) photoproducts within UVB irradiated skin also is shown. The results are expressed in percentage of residual lesions and are the average ± SD of data obtained with four different donors. The statistical significance in the level of remaining T<>T between UVA and UVB radiation was calculated by using the Student t test. Difference between UVA and UVB was found to be statistically significant at 24 h (P < 0.002) and 48 h (P < 0.05).