Function
Required, together with Trl, for maintaining the repressed state of target genes including homeotic genes Scr and Ubx. May also be involved in the activation of homeotic genes. Binds to a DNA Polycomb response element (PRE) at the bithorax complex. Also binds to polytene chromosomes at several hundred sites, many of which are shared with Trl and ph-p. Required during embryonic development.