Akaboshi E, Altman S
Nucleic Acids Res. 1983 Jun 11;11(11):3687-702. doi: 10.1093/nar/11.11.3687.
A new monovalent and divalent requiring endoribonuclease has been identified in extracts of calf heart tissue using a natural substrate molecule. This ribonuclease creates 5' hydroxyl and 3' phosphate groups in its cleavage products. It cleaves predominantly between pyrimidine and A residues though not all such possible sites are attacked in the substrates tested.