Location of ISPpu17 (a) and ISUnCu13 (b) relative to intI1 and qacE/qacEΔ1. Large arrows show orientation of ORFs, inverted repeats (IR) in red and underlined in sequences; LH IR, left hand IR, RH IR, right hand IR; part of attI supplied by integron, vertical lined areas; part of attI supplied by cassette, cross hatched areas; attIΔ, attI interrupted by IS; Pc, promoter driving cassette gene expression; RBS, ribosomal-binding site, underlined by dashed line; attI, recombination site, underlined by dashed and dotted line in sequence.