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(A) A model of the sporulation-specific phage-mediated gene rearrangement, based on the cases of SPβ in B. subtilis and B. amyloliquefaciens. (B) Maintenance of the intervening element in the host genome. Sporulation gene (spo gene), black box; attachment sites, triangle; intervening element, red line; sprA and sprB, red arrow; phage-related genes, red box; host genes, open box.
