'CpG islands' are often associated with promoter regions. A CpG island has traditionally been defined as a 200 bp region of DNA with a G+C content over 50% and an observed/expected CpG ratio of 0.6 or ...
Acetylation of histone H3 at the nucleosome surface is associated with destabilised nucleosomes and is a useful new functional genomics mark for identifying regulatory regions of the mammalian genome.
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