Figure 2.

Morphologic changes and cyclobutane pyrimidine dimer (CPD) production of UV-irradiated DLD-1 cells. (a) The images 4 h after UV irradiation and the control via phase contrast microscopy and the nucleus of the DLD-1 cells irradiated with UV are shown using DAPI staining. (b) DNA samples extracted after F-UV irradiation (black bars) or D-UV (grey bars) were measured for amounts of CPD per µg of DNA. ELISA for CPD was the result of three wells derived from the same samples. Mean values with standard errors are shown in the graphs.