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. Author manuscript; available in PMC: 2010 Jan 1.
Published in final edited form as: Photochem Photobiol. 2009 Jan–Feb;85(1):379–386. doi: 10.1111/j.1751-1097.2008.00455.x

Figure 1.

Figure 1

Endogenous DNA damage in cultured keratinocytes derived from patients of WT and null GSTM1 genotype. Comet assays were performed on keratinocyte outgrowths from skin samples from patients who were genotyped as either GSTM1 wild type (WT; n = 11) or GSTM1 null (n = 12) as described in Materials and Methods. Average tail moment (TM; left panel) and tail intensity (TI) values (right panel) are shown (±SEM). The TM values are expressed in arbitrary units. The TI reflects % DNA in the tail. Differences in the mean values were found to be significant at P < 0.05 using Student's t-test.