Table 1.

Sum of the yield of formation of all bipyrimidine photoproducts in irradiated human skin

Donors	UVA		UVB
	Skin	Cultured keratinocytes	Skin	Cultured keratinocytes
A	0.065 ± 0.017	0.121 ± 0.024	431.0 ± 104.1	12,934 ± 278
B	0.113 ± 0.018	0.129 ± 0.004	656.8 ± 142.0	11,304 ± 124
C	0.077 ± 0.008	0.117 ± 0.013	546.7 ± 71.8	11,139 ± 620
D	0.076 ± 0.008	0.136 ± 0.006	511.4 ± 30.4	12,464 ± 318
E	0.080 ± 0.008	0.106 ± 0.010	425.1 ± 89.5	7,505 ± 215
F	0.076 ± 0.013	0.143 ± 0.007	542.2 ± 76.4	12,409 ± 253
Mean	0.081 ± 0.017	0.125 ± 0.014	518.8 ± 78.4	11,293 ± 1,811
Ratio keratinocytes/skin	1.5		21.8

For each donor, the yield (expressed in lesions per 10⁶ normal bases per Joules per centimeter squared) was calculated from the linear regression for the sum of the level of all photoproducts with respect to the applied UV dose. The reported value is the slope ± SE. Mean represents the average ± SD.