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The attR site of bacteriophage λ and nucleotide sequences of wild-type and variant Xis binding sites. The two arm-type binding sites, P1 and P2, and the two core-type sites, C and B′, on the attR region are recognized by Int. IHF binds to the sites designated as H1 and H2. Xis binds to the X1 and X2 sites. FIS binds to the F site. The isolation of the mutant Xis binding sites 2B10, 2B29, and 2B22 has been described by Numrych et al. (18). Δ, deletion of the indicated base.
