Genomewide analysis of PRC1 and PRC2 occupancy identifies two classes of bivalent domains. Ku M, Koche RP, Rheinbay E, et al. Genomewide analysis of PRC1 and PRC2 occupancy identifies two classes of bivalent domains. PLoS Genet. 2008;4(10):e1000242. doi:10.1371/journal.pgen.1000242 Read more