heteropyknosis

noun
het·​ero·​pyk·​no·​sis
variants: also heteropycnosis \ ˌhet-​ə-​rō-​pik-​ˈnō-​səs \

Medical Definition of heteropyknosis 

: the quality or state of some chromosomes or of parts of some chromosomes in a nucleus of taking up more stain and being more tightly coiled or of taking up less stain and being less tightly coiled than is usual — compare isopyknosis

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