Couvillion MT, Bounova G, Purdom E, Speed TP, Collins K.

Mol Cell. 2012 Nov 30;48(4):509-20. doi: 10.1016/j.molcel.2012.09.010

A Tetrahymena Piwi bound to mature tRNA 3' fragments activates the exonuclease Xrn2 for RNA processing in the nucleus.

tRNA fragments indirectly implicated in rRNA processing.