Figure 2 attB core sequences of Streptomyces and related genera. (a) Comparison of attP of /C31, attL and attR of S. rimosus exconjugants
and attB of S. rimosus (highlighted nucleotides, GenBank accession no. EF670587). (b) Alignment of attB core sequences from Streptomyces. (c)
Alignment of attB core sequences from other actinomycetes compared with the sequences in (b). Conserved nucleotides are highlighted, and the
integration sites for crossing-over (TT) are in bold. Cited references and GenBank accession numbers are indicated at the end of each attB
sequence.