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We have determined the nucleotide sequence of a secondary phage lambda attachment site (att) located between the structural genes of the ribitol and D-arabitol catabolic operons of Klebsiella aerogenes. The core region of this secondary attachment site (sequence: GGCGATTAT) shows considerable homology with the 15-base-pair core region common to both the phage att and the primary bacterial att of Escherichia coli K12 (sequence: GCACTAA); however, there is no such clear homology between the sequences flanking the cores of the primary att and this secondary att. Integration of phage lambda into the K. aerogenes secondary att occurred by recombination between the core region of the phage att and an oligo(T.A) stretch located within the K. aerogenes secondary att.

Sequence of a secondary phage λ attachment site located between the pentitol operons of Klebsiella aerogenes