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#Unit 2. Cellular Organization
In some cases, the various heterochromatic regions, especially those associated with centromeres, aggregate into a densely staining chromocenter.
The common form of heterochromatin that always remains heterochromatic is called constitutive heterochromatin.
It is permanently condensed.
It replicates late in S phase and has a reduced frequency of genetic recombination relative to euchromatic gene rich areas of the genome.
