MutS homologue 2 (MSH2) is a DNA mismatch repair protein in the MutS family (1). MSH2 forms two different heterodimers: MutS alpha (MSH2-MSH6) and MutS beta (MSH2-MSH3) that bind to DNA mismatches thereby initiating DNA repair. (2). MutS alpha bends the DNA helix and recognizes single base mismatches and dinucleotide insertion-deletion loops (IDL) in the DNA (2). MutS beta recognizes larger insertion-deletion loops up to 13 nucleotides long (2). Heterozygous mutations in the MSH2 gene are a cause of hereditary nonpolyposis colorectal cancer (HNPCC), forming a specific mispair binding complex with MSH3 and MSH6 (3, 4). MutS alpha may also play a role in DNA homologous recombination repair (2).