The Drosophila HP1 homolog Rhino is required for transposon silencing and piRNA production by dual-strand clusters.
Klattenhoff C, Xi H, Li C, Lee S, Xu J, Khurana JS, Zhang F, Schultz N, Koppetsch BS, Nowosielska A, et al. Cell. 2009 Sep 18; 138(6):1137-49. Epub 2009 Sep 3.