Phylogenetic relationships between Gypsy retroelements. Phylogeny of Gypsy sequences of genus Zaprionus (green squares), the melanogaster subgroup (red circles), D. willistoni (blue triangles) and S. latifasciaeformis (pink circles). Numbers in squares indicate the clade number mentioned in the text. The tree was reconstructed using the maximum-likelihood method (HKY85 distance), as implemented in the PhyML program. The branch support was calculated using bootstrap test (1000 replications). Numbers next to species names indicate the clone or genomic sequence identification.