Enables chromatin binding activity; methylated histone binding activity; and single-stranded RNA binding activity. Acts upstream of or within sebaceous gland development. Located in heterochromatin and nucleus. Part of PRC1 complex. Is expressed in brain. Human ortholog(s) of this gene implicated in breast cancer; multiple myeloma; and myeloid leukemia. Orthologous to human CBX7 (chromobox 7). [provided by Alliance of Genome Resources, Apr 2022]