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facultative heterochromatin

A type of heterochromatin (condensed and genetically inactivated portion of a chromosome) which forms at specific stages of an organism's life cycle. In contrast with constitutive heterochromatin (the other type of heterochromatin), facultative heterochromatin occurs in only one of the two members of a homologous chromosome pair and is not permanent.

Selected facultative heterochromatin links:

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