Mung Bean Nuclease acts as a preferential DNA and RNA endonuclease, hydrolyzing single-stranded DNA and RNA into 5'-phosphate- and 3'-hydroxyl-containing products. If used at very high concentrations, Mung Bean Nuclease is also capable of degrading double-stranded DNA, RNA or DNA/RNA fragments from both ends. Due to its single-stranded DNA and RNA endonuclease activity, Mung Bean Nuclease is often used during transcript mapping, duplex or hybrid DNA and RNA blunt ending, and cDNA preparation.