“…cluding transposable elements, histone genes, microsatellite repeats and/or U1/U2 small nuclear RNA (snRNA) genes [Cioffi et al, 2010;Úbeda-Manzanaro et al, 2010;Ferreira et al, 2011;Hashimoto et al, 2011;Cabral-deMello et al, 2012]. The U snDNA is a multigene family of non-coding RNAs that compounds the spliceosome machinery and may be subdivided into 5 types, including U1, U2, U4, U5, and U6 [Valadkhan, 2005].…”