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Mixtures containing radiolabelled DNA, ASR1, ZnCl2 and the indicated amounts of non-labelled DNA were incubated then filtered through nitrocellulose membranes. Membrane-retained radioactivity was determined as described in Figure 4(C). ▪ and □, bacteriphage λ DNA; ▴ and ▵, poly(dI-dC)·poly(dI-dC); • and ○, pBluescript. Open symbols, controls without ASR1; closed symbols, with ASR1.
