FIG. 3.

Probable mechanism of the formation of various classes of a single type of TMo. (A) The white arrows show the direction of transcription of the transposase gene (tnp). The potential secondary IRR sequences (IRR′, IRR", and IRR‴) occurring in the adjacent DNA fragments are marked. Black arrowheads and broken lines indicate the potential sites of transposase action. The localization of the P₁ and P₂ promoters of ISPme1 is indicated. (B) Comparison of IRL and IRR sequences of ISPme1 and IRRs of TMos captured by pMEC1. The short conserved GC- or AT-rich sequences are shown on dark gray and light gray backgrounds, respectively.