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PRF-1 complex is specifically competed by HSA −67/−38, but not by Spl consensus sequences. The HSA −67/−38 probe was incubated with MT-1 nuclear extract; the control reactions are shown in lanes 1 and 4. Lanes 2 and 3, and 5 and 6, show competition with 40- and 80-fold molar excesses of self(S) and Spl consensus, respectively.
