Alignment of selected Su(var)3-9 proteins. Arthropod proteins with and without N-terminal eIF2γ fusion are represented by Drosophila melanogaster (Dme) , Cercopis vulnerata (Cvu, cicada), Acyrthosiphon pisum (Api, aphid), Enallagma cyathigerum (Ecy, damselfly), Lepisma saccharina (Lsa, silverfish) and Araneus diadematus (Adi, spider). Additionally, human SUVH1 is shown (Hsa) . Identical amino acid residues are underlaid dark gray, whereas similar residues are marked light gray. The domains of Su(var)3-9 are marked below the alignment. Binding sites of used degenerate oligonucleotide primers are shown above the sequences.