J Biol Chem. 2004 Jul 23;279(30):31337-47. doi:10.1074/jbc.M402394200

Nandakumar J, Ho CK, Lima CD, Shuman S.

RNA substrate specificity and structure-guided mutational analysis of bacteriophage T4 RNA ligase 2.

Can ligate RNA at a 3'-OH/5'-P nick in a RNA/RNA or RNA/DNA duplex.