Characteristics and phylogenetic position of Helos1. a - Helos1 sequences aligned on the amino acid level. The highly conserved Helos1-specific motif is highlighted. b - Neighbor-joining phylogenetic tree of Ty1-copia. Branches leading to Helos1 sequences are depicted in black. A bootstrap value supporting the Helos1 clade is shown above the branch. The scale bar indicates Tamura 3-parameter distance.