Clustering by phylogenetic analysis of SIDER2 elements found in the L. infantum chromosome 32. The alignment of the SIDER2 sequences was produced by ClustalW [see Additional file 1]. The phylogenetic tree was constructed with the program MEGA version 3.1 using the Neighbour-Joining method. The elements 32-775723r and 32-1141454r were excluded from the phylogenetic analysis because the program failed when calculating the Kimura distances for these sequences. Bootstrap values, expressed as percentages, were obtained from 1000 replicates. Only values higher than 50 are shown. The positions of the different subfamilies (A-M) are shown in the right margin. The scale represents number of changes per nucleotide.