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AFM images of M13 ssDNA–E. coli SSB on mica with a concentration ratio R [=(SSB tetramers)/(nucleotides)] equal to 1/30 in (a) Tris 20 mM pH 7.5, NaCl 20 mM, MgCl2 10 mM and, (b) Tris 20 mM pH 7.5, NaCl 20 mM, SpdCl3 50 µM (scale bars 500 nm).
