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Heterochromatin
Definition 1
A tightly packed area of chromatin that may function to protect chromosome integrity and regulate gene expression. (NCI Thesaurus)
Definition 2
The portion of chromosome material that remains condensed and is transcriptionally inactive during INTERPHASE. (NLM, Medical Subject Headings)
Definition 3
regions of the genome that are permanently in a highly condensed condition and are not genetically expressed. (NIH CRISP Thesaurus)
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