Table 3.

Distinctive Chromatin Features of Genomic Elements

Functional Annotation	Histone Marks	References
Promoters	H3K4me3	(Bernstein et al., 2005; Kim et al., 2005; Pokholok et al., 2005)
Bivalent/Poised Promoter	H3K4me3/H3K27me3	(Bernstein et al., 2006)
Transcribed Gene Body	H3K36me3	(Barski et al., 2007)
Enhancer (both active and poised)	H3K4me1/H3K4me3-	(Heintzman et al., 2007)
Poised Developmental Enhancer	H3K4me1/H3K27me3	(Creyghton et al., 2010; Rada-Iglesias et al., 2011)
Active Enhancer	H3K4me1/H3K27ac	(Creyghton et al., 2010; Heintzman et al., 2009; Rada-Iglesias et al., 2011)
Polycomb Repressed Regions	H3K27me3	(Bernstein et al., 2006; Lee et al., 2006)
Heterochromatin	H3K9me3	(Mikkelsen et al., 2007)