HSC Bivalent promoters

Bivalent chromatin is a segment of DNA, bound to histone proteins that have both repressing and activating epigenetic marks in the same region. Explicitly at bivalent promoters, with the presence of both H3K27me3 (repressive marks) and K3K4me3 (activating marks), almost twenty percent of domains had significant age-associated alterations with almost half of the modified bivalent promoters…