Dictionary of Human Evolution and Biology

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1. densely staining chromatin that appears as nodules in or along extended chromatids.

2. during cell division, densely staining portions of condensed chromosomes. These regions are positively heteropycnotic and thus have different staining (e.g. dark with Giemsa stain) properties than euchromatin, and have relatively few active genes. Adjective: heterochromatic. Thought to consist of highly repetitive DNA and some protein-coding genes.

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