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Competition experiments determining the specificities of binding of Tn3R to plasmid DNA containing specific and nonspecific sites, by using pUC71K (no binding sites for Tn3R; open circles, solid curve, x50 = 1000), pCO1 (one copy of binding site I; crosses, dashed curve, x50 = 100), and pMM1 (two complete res sites, i.e., six Tn3R binding sites; solid circles, dashed curve, x50 = 200). The value x is defined in the text.
