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pr::IS26-blaSHV (A) and pr-blaSHV (B). Identical sequences in the promoter regions are underlined with dotted lines. The pr::IS26-blaSHV cassette contains the IS26 element inserted next to the −10 region (15). The pr-blaSHV cassette does not contain IS26 element and is identical to the prototype SHV-1 upstream region (15).
