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A strong lethal interaction was observed between various monochromatic wavelengths (254, 334, 365, and 405 nm) in the repair-proficient E. coli K-12 strain AB 1157, except in the case of preexposure to 405-nm radiation which resulted in a protection against the inactivation resulting from subsequent exposure to 365or 254-nm radiations. The results may be tentatively explained by assuming two classes of DNA lesions and two classes of damage to repair (reversible and irreversible) whosedoi:10.1128/jb.136.1.437-440.1978 fatcat:ykdfues5cfbelec7x3rvlbdh3e