FIG. 4.

(a) Schematic representation of the ORFs in related IS or IS-like elements. The hatched areas indicate the regions with homology at the amino acid level. Percentages of identical amino acids (id.) are shown. (b) Terminal regions of the elements shown in panel a. The solid arrows indicate the inverted repeats and their orientations (7, 45). The dotted arrow below the nucleotide sequence of the SalI fragment from P51 indicates a putative left inverted repeat that was delineated on the basis of similarity to the sequence of IS1600. The asterisks indicate identical nucleotides in the juxtaposed sequences that are not included in the inverted repeats of IS1600 and the SalI fragment from P51.