Polycomb Repressive Complex 2 (PRC2)-mediated trimethylation of histone H3 on lysine 27 (H3K27me3) and methylation of histone 3 on lysine 9 (H3K9me) are two repressive epigenetic modifications that are typically localized in distinct regions of the genome. For reasons unknown. however. they co-occur in some organisms and special tissue types. https://ashleyshomestores.shop/product-category/top-mount-fridge/