Polycomb group (PcG) protein. Component of the prc2/eed-ezh2 complex, which methylates 'Lys-9' and 'Lys-27' of histone H3, leading to transcriptional repression of the affected target gene (By similarity). May play a role in neural induction. Component of the prc2/eed-ezh2 complex (By similarity). Can interact with ezh2, hdac1 and taf9 (By similarity). Interacts with yy1. Maternally and zygotically expressed. Expression decreases between late blastula and early gastrula. Belongs to the WD repeat ESC family.