ABSTRACT: Adduct-induced DNA damage can affect transcription efficiency and DNA replication and repair. We previously investigated the effects of the 3'-next flanking base (G*CT vs G*CA; G*, FABP, N-(2'-deoxyguanosin-8-yl)-4'-fluoro-4-aminobiphenyl; FAF, N-(2'-deoxyguanosin-8-yl)-7-fluoro-2-aminofluorene) on the conformation of arylamine-DNA lesions in relation to E. coli nucleotide excision repair ( Jain , V. , Hilton , B. , Lin , B. , Patnaik , S. , Liang , F. , Darian , E. , Zou , Y. , Mackerell , A. D. , Jr. , and Cho , B. P. ( 2013 ) Nucleic Acids Res. , 41 , 869 - 880 ). Here, we report the differential effects of the same pair of sequences on DNA replication in vitro by the polymerases exofree Klenow fragment (Kf-exo(-)) and Dpo4. We obtained dynamic (19)F NMR spectra for two 19-mer modified