sentences:  It also dimerizes with MSH3 to form the MutSβ DNA repair complex.MSH2 is involved in many different forms of DNA repair, including transcription-coupled repair, homologous recombination, and base excision repair.Mutations in the MSH2 gene are associated with microsatellite instability and some cancers, especially with hereditary nonpolyposis colorectal cancer (HNPCC).