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Hybridization of NCK203 and P335 phage DNAs with a probe from the putative operator region, upstream of cI. (A) Agarose gel of EcoRI-digested DNA. (B) Hybridization with a 32P-labeled probe amplified with the P1-forward and P1-reverse primers from φ31 DNA. Lanes: 1, genomic NCK203 DNA; 2 and 13, 1-kb ladder; 3 to 12, DNA from phages φ31, φ31.1, φ31.2, ul36, ul37, Q30, Q33, Q36, mm210a, and mm210b.
