Abstract
All genomes exhibit several levels of compartmentation. “Genomic compartment” means a continuous stretch of DNA recognizable as a separate entity by structural or functional criteria. In a narrow sense, genomic compartments are sometimes defined as a collection of DNA molecules derived from long chromosomal regions of relatively uniform composition corresponding to either Giemsa dark bands (called G-bands) or Giemsa pale, Reverse bands (called R-bands) observed on chromosomes upon staining. In a broader sense, a chromosomal band, a gene cluster, an exon, or a stretch of DNA present in a particular nucleosome can also be considered as a separate compartment.
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