Facultative heterochromatin

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Facultative heterochromatin is formed during development and is often the condensation of regions which contain coding genes. An example of facultative heterochromatin is the formation of Barr bodies (inactivated X chromosomes), which occurs during cell division[1]. The silencing of genes in facultative heterochromatin may be reversed, but if the phenotype of the organism is stable then this process is unlikely[2].

References:

  1. BioMed Central, Saksouk N, Simboeck E, Déjardin J, Constitutive heterochromatin formation and transcription in mammals. 15th January 2015 [cited:03/12/2017]; Available from: https://epigeneticsandchromatin.biomedcentral.com/articles/10.1186/1756-8935-8-3
  2. Armstrong L, Epigenetics. 1st Edition, New York: Garland Science. 2014
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