Effect of Aβ40 fragment on mobility of DNA in 0.8% agarose gel electrophoresis stained by EB. Lane M was the DNA marker. Lanes 1–4 were the samples of polydGdC:polydGdC with Aβ incubated at room temperature for 1, 2, 3, and 4 days, respectively. As control, lanes 5–8 were polydGdC:polydGdC alone incubated for 1, 2, 3, and 4 days, respectively.