Fig. 2

a Dendrogram representing the relationship among the 69 IS982 transposases. Protein sequences were first aligned with MAFFT, and the relationship tree was established via neighbor joining, with a bootstrap value of 100, followed by a rooting [35]. Blue, pink and green colors refer to the IS original hosts as Gram-negative bacteria, Gram-positive bacteria and archaea, respectively; b WebLogo [28] 3 comparison of the left (top) and right (bottom) IR of each cluster; c complete IS element nt length range (bp); d transposase protein length range (aa); e Direct repeats length range (bp) and f count of bacterial and archaeal groups within each cluster