• Unit Definition: One unit is defined as the amount of enzyme required to inhibit by 50% the hydrolysis of cytidine 2',3'-cyclic monophosphate by 5 ng of RNAse A.
• Source: A recombinant E. coli strain carrying the porcine RNase Inhibitor gene.

RNAse Inhibitor is a potent inhibitor of ribonucleases such as RNase A, RNase B, and RNase C. The 52 kDa protein is a fusion of the porcine RNAse Inhibitor gene with a proprietary 22.5 kDa protein tag.