piRNA islands

Marc R. Friedländer, Catherine Adamidi, Ting Han, Svetlana Lebedeva, Thomas A. Isenbarger, Martin Hirst, Marco Marra, Chad Nusbaum, William L. Lee, James C. Jenkin, Alejandro Sánchez Alvarado, John K. Kim, and Nikolaus Rajewsky (2009) High-resolution profiling and discovery of planarian small RNAs. PNAS, 2009 June 29