Figure 4.

The ability of wavelengths at the UV/visible border (385–405 nm) to induce CPD over time in vivo assessed by HPLC-MS/MS. Human volunteers were unexposed, or exposed to 0–150 J/cm² of (a) 385 nm or (b) 405 nm radiation. Biopsies were taken 0–24 hrs post exposure. DNA was extracted and CPDs were assessed by HPLC MS/MS. Each point represents mean (n = 4 per time point, from 8 volunteers). The high 0 Hour value with the 385 nm source is a probable outlier.