Grosswendt S, Filipchyk A, Manzano M, Klironomos F, Schilling M, Herzog M, Gottwein E, Rajewsky N.

Mol Cell. 2014 Jun 19;54(6):1042-1054. doi:10.1016/j.molcel.2014.03.049

Unambiguous identification of miRNA:target site interactions by different types of ligation reactions.

Endogenous activity (speculated to be tRNA ligase) detected in the negative controls.