Figure 2.

Formation of 8‐OH‐dG in the cellular DNA of HaCaT cells irradiated with (a) broadband and (b) narrowband ultraviolet (UV) B. Data are expressed as the mean ± SD of determinations on four to five independently irradiated dishes of keratinocytes. *P < 0.05, compared with the unirradiated samples (0 mJ/cm², the background level). MED, minimal erythema doses of Japanese individuals whose skin types were III to IV, defined according to the Fitzpatrick classification. ⁽⁵⁴⁾ Treatment: broadband UVB and narrowband UVB doses for psoriasis vulgaris in our institution.