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Three types of DNA: ∼2700bp polydeoxyguanylic olydeoxycytidylic acid [poly(dG)–poly(dC)], ∼2700bp polydeoxyadenylic polydeoxythymidylic acid [poly(dA)–poly(dT)] and 2686bp linear plasmid pUC19 were deposited on a mica surface and imaged by atomic force microscopy. Contour length measurements show that the average length of poly(dG)–poly(dC) is ∼30% shorter than that of poly(dA)–poly(dT) and the plasmid...
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