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| Talk Medical > Medical Dictionary > Facultative Heterochromatin |
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Facultative HeterochromatinFacultative heterochromatin: Chromosome material that can be either heterochromatin or euchromatin. The inactive X chromosome is made up of facultative heterochromatin. When a woman transmits that X chromosome to a son, the chromosome reverts to the euchromatic state and to genetic activity.
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