This domain can be found in the Polycomb repressive complex 2 (PRC2) present in Homo sapiens. Polycomb complexes maintain repressive chromatin states by silencing gene expression. PRC2 does this by methylating lysine 27 of histone H3. This domain makes up part of the N-lobe which is involved in regulation [1].

1: Structural basis of oncogenic histone H3K27M inhibition of human polycomb repressive complex 2. Justin N, Zhang Y, Tarricone C, Martin SR, Chen S, Underwood E, De Marco V, Haire LF, Walker PA, Reinberg D, Wilson JR, Gamblin SJ; Nat Commun. 2016;7:11316. PMID:27121947