Figure 7.

The organisation of significant repeats and genes among the Mu-like transposons. Terminal inverted repeats are boxed and the 6–8 bp spacers between the termini (including the conserved 5′-terminal TG) and the first 19–23 bp repeats are marked with shadowed boxes. Each arrow represents one repeat and its orientation. The arrows showing repeats i3 and i4 that were negative for binding TniA are shadowed. The internal activator sequence of Mu (IAS) is indicated with two filled boxes. The transposition genes encoded by each element are mentioned by their designations in physical order. The gene designations of the tandem genes encoding a transposase and a nucleotide-binding protein, common for the Mu-related elements, are underlined.