...where both strands are transcribed. Like miRNAs, endosiRNAs interact with Argonaute proteins. endo-siRNAs likely have roles in silencing of transposable elements or pseudogenes (Okamura et al. 2008). A third class of 25–30 nt RNAs has been identified in Drosophila, zebrafish, mice, rats, anemones...