Component of the post-replicative DNA mismatch repair system (MMR). Forms the heterodimer MutS gamma (MSH2-MSH7 heterodimer) which binds to DNA mismatches thereby initiating DNA repair. MutS gamma recognizes specifically the T/G single base mismatch, but not trinucleotide insertion-deletion loops (IDL). Heterodimer consisting of MSH2-MSH7 (MutS gamma). Belongs to the DNA mismatch repair MutS family.