Main . Heterochromatin and euchromatin are defined cytologically as condensed and decondensed regions of the genome, respectively1 , 2. Constitutive heterochromatin, although gene poor, contains noncoding DNA repeat elements that are often abundantly transcribed3 , 4. During interphase, heterochromatin-containing domains within different chromosomes cluster together forming structures termed chromocenters5 , 6 , 7 , 8. In mouse cells these dynamic structures a...
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