Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Tightly coiled chromosomal material that stains deeply during interphase and is believed to be genetically inactive.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun cytology
Heterochromatic tightly coiled chromosome material ; believed to begenetically inactive
Etymologies
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Examples
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"In recent years it has become apparent that heterochromatin is critical for many essential functions."
Comparing Teleological Predictions with their Non-teleological Counterparts 2007
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"These modifications cause parts of chromosomes to condense into so-called heterochromatin, burying the regulatory regions of p53 target genes deep within," says graduate student and co-first author Fanny E. Estermann.
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In general, C-bands and G-bands are complexed with proteins and RNAs to give a more compact organization called heterochromatin, whereas R-bands have a more open conformation referred to as euchromatin.
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In contrast, a major part of the, non-active 'more compacted DNA regions, termed heterochromatin, are located in the nuclear periphery.
GEN News Highlights 2009
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The study concentrates on understanding material called heterochromatin that assembles on centromeric sequences.
unknown title 2009
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In general, C-bands and G-bands are complexed with proteins and RNAs to give a more compact organization called heterochromatin, whereas R-bands have a more open conformation referred to as euchromatin.
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In other words, the so-called "heterochromatin" with which the cytologist deals in studying mitotic chromosomes is a quite different thing from, although in the neighborhood of, the heterochromatin proper having the above described complex of properties.
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~ Exploring the Dark Matter of the Genome -- "Not so long ago, the difficult-to-sequence, highly repetitive, gene-poor DNA found in regions of chromosomes known as heterochromatin was called "junk."
Speedlinking 6/15/07 William Harryman 2007
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In non-dividing cells, DNA is associated with proteins to form the so-called chromatin, with more condensed "heterochromatin" at the periphery and less condensed "euchromatin" in the interior.
unknown title 2009
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In non-dividing cells, DNA is associated with proteins to form the so-called chromatin, with more condensed "heterochromatin" at the periphery and less condensed "euchromatin" in the interior.
unknown title 2009
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