Taylor, D.W., Ma, E., Shigematsu, H., Cianfrocco, M.K., Noland, C.L., Nagayama, K., Nogales, E., Doudna, J.A. and Wang, H.-W. (2013) Substrate-specific structural rearrangements of human Dicer. Nat. Struct. Mol. Biol.20(6)662-70.