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Typical set of AFM topographic images obtained in tapping mode in air for nucleosome arrays reconstituted on 32 repeats of 601 positioning DNA sequences (repeat length 197 bp) with (a–d) the conventional histone H2A, (e–h) the histone variant H2A.Bbd, and (i–l) the chimeric variant histone Bbd.ddH2A.
