Zelle, B.

repair strain group complementation number level result fusion lesion near-uv dimers nuclei mutation experiment pyrimidine dimers irradiation grain xp cells radiation pyrimidine medium complementation group complementation groups xp strains uv-endo sites removal period study synthesis dna synthesis far-uv culture excision near-uv >290 nm patient defect 254 nm uv xeroderma uv-endo xp 230s difference value fibroblast xp 25ro repair capacity damage uv-irradiated capacity method dna repair excision repair control survival cho cells 4 nqo product >290 nature uv-endonuclease-susceptible sites xp 2bi cells region xp 20ro heterokaryon setlow dimer pigmentosum effect xp 20ro cells exposure uv dose induction analysis lohman wavelength xp 2ro process >310 weight control cells >310 nm uv