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constitutive heterochromatin
Constitutive heterochromatin domains are sections of DNA that occur throughout the chromosomes of eukaryotes, but particularly at the centromeres, telomeres and repetitive sequences. They often consist of very highly condensed, repetitive DNA and are largely transcriptionally silent. These regions normally appear darkly stained in karyograms.
Unlike facultative heterochromatin, constitutive heterochromatin is never converted back into euchromatin. The regions of DNA that exist as constitutive heterochromatin will be the same for all cells of a given species.
Constituitive heterochromatin is stained specifically with the C-banding technique.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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