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Effect of gamma-irradiation and UV-irradiation dose titration on the 3H-thymidine incorporation of melanoma cell lines. Melanoma cell lines, either untreated or treated with the indicated dose of (A) gamma-irradiation or (B) UV-irradiation, were cultured in vitro for five days prior to the addition of 3H-thymidine for 18 to 24 hr.
