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AFM images of λ DNA adsorbed naturally onto mica surface by 5 mM Mg2+. (A) Untreated (free) DNA. (B) DNA treated by 77 µM cisplatin for 6 h. (C) DNA treated by 770 µM cisplatin for 1 h. (D) DNA treated by 770 µM cisplatin for 6 h. All scale bars are 500 nm.
