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Abstract— 8‐methoxypsoralen monoadduct formation in calf thymus DNA irradiated with subbands of ultraviolet A light has been quantitated by HPLC analysis of the enzymatic hydrolysates of the DNA. Normalization of the yield of monoadducts for the variation in source output and the absorptivity of 8‐MOP at each of the irradiating wavelengths showed that the 4′,5′‐furan monoadduct was the principal photoproduct and the efficiency of its formation was independent of irradiating wavelength. Synthetic polynucleotides irradiated with ultraviolet A light demonstrated a base composition and sequence dependence for 8‐MOP photoreactivity: (poly(dAdT.dAdT) > poly(dA.dT) > poly(dGdC.dGdC) in both the B and Z forms > pofy(dT).
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Gasparro et al. (1985) studied this question.
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