GenCRISPR™ ErCas12a Nuclease is an RNA-guided DNA endonuclease from Eubacterium rectale. Cas12a (previously known as Cpf1) belongs to the Class 2 Type V CRISPR/Cas system. Different from CRISPR/Cas9 system, the ribonucleoprotein (RNP) complex of CRISPR/Cas12a system is formed by Cas12a and crRNA, it recognizes a T-rich protospacer adjacent motif (PAM) and results in a staggered DNA double-strand break (DSB). After the specific cleavage, Cas12a can also activate collateral cleavage activity towards adjacent non-specific ssDNA sequences. Hence, Cas12a nuclease is a good alternative for Cas9 in certain target DNA editing, and provides a novel strategy for DNA detection.