A simple, rapid, and reproducible test has been developed to measure the viability of cells after irradiation with ultraviolet light (UV). Epstein-Barr virus-transformed lymphoid lines, derived from patients with xeroderma pigmentosum (XP), were irradiated with UV, and the post-UV viability of the lymphoid lines was determined by the trypan blue dye exclusion method. The relative post-UV survival of the patients' lymphoid lines was similar to the relative post-UV survival of the patients' fibroblast strains.
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