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Autoradiogram of 13% PAA/8M urea denaturing gel showing DNase I footprint of 158-mer HindIII/NdeI fragment of the plasmid pSP73 in the presence of different concentrations of [Fe2(L-CF3)3]4+. Lanes 1–3; DNA mixed with [Fe2(L-CF3)3]4+ at 4:1, 10:1 and 40:1 (base:cylinder) ratios, respectively; lane 4; DNA in the absence of the cylinder; lanes G + A and G correspond to Maxam–Gilbert G + A and G ladders. The nucleotide sequence of the fragment is shown on the right side of the gel.
