heterochromatization

noun
het·​ero·​chro·​ma·​ti·​za·​tion | \ˌhet-ər-ō-ˌkrō-mə-tə-ˈzā-shən \
variants: also heterochromatinization \-​mə-​tin-​i-​ˈzā-​ \ also British heterochromatisation also heterochromatinisation

Medical Definition of heterochromatization 

: the transformation of or the extent of the transformation of genetically active euchromatin to inactive heterochromatin

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