Valen, E., Preker, P., Andersen, P. R., Zhao, X. B., Chen, Y., Ender, C., Dueck, A., Meister, G., Sandelin, A., & Jensen, T. H. (2011). Biogenic mechanisms and utilization of small RNAs derived from human protein-coding genes. Nature Structural & Molecular Biology, 18(9), 1075-1082.