CBX2 (UniProtKB/Swiss-Prot entry Q14781) is a component of the PRC1-like polycomb multiprotein complex, which is required to maintain the transcriptionally repressive state of many genes throughout development via chromatin remodeling and modification of histones. The PRC1 complex mediates monoubiquitination of histone H2A on lysine 119, introducing heritably changed expression. CBX2 is involved in sexual development. Mutations in CBX2 are associated with gonadal dysgenesis in humans.