SURVEYOR Mutation Detection Kits and the SURVEYOR Check-It Kit provide reagents and protocols for the detection of mutations in DNA. All of these kits are based on the use of SURVEYOR Nuclease, a mismatch-specific endonuclease derived from celery, that has been shown to recognize and cleave all types of mismatches arising from the presence of single nucleotide polymorphisms (SNPs) or from small insertions or deletions. The protocol is based on the generation of PCR products that are subsequently hybridized to generate mismatches in heteroduplexed DNA which is then treated and cleaved by SURVEYOR Nuclease as outlined in the four-step protocol below.