 Through apoptosis, the cells are self-disassembled into compartments with their subsequent utilization (mainly by neighboring cells).The first time sign of the beginning of the apoptosis system is working in a UV damaged cell is the activation of restriction enzymes, which divide cell DNA into fragments convenient for utilization.But too large a dose of UVR can lead to breakdown (inactivation) of the energy-dependent mechanism of apoptosis (super lethal damage).