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Core PRCs and their chromatin-modifying activities. (A,B) Compositions of the polycomb repressive complexes PRC2 (A) and PRC1 (B) in animals and plants, where Drosophila, human, and Arabidopsis were taken as representatives. (C) Schematic representation of the H3K27me3 deposition, erasure, and its roles in gene silencing. Acronyms and further details are explained in the text.
