noun Genetics.
the part of a chromosome that condenses maximally during metaphase and contains most of the genetically active material.

1930–35; eu- + chromatin

euchromatic [yoo-kruh-mat-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
euchromatin (juːˈkrəʊmətɪn)
Compare heterochromatin the part of a chromosome that constitutes the major genes and does not stain strongly with basic dyes when the cell is not dividing

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American Heritage
Medical Dictionary

euchromatin eu·chro·ma·tin (yōō-krō'mə-tĭn)
Chromasomal material that consists of uncoiled dispersed threads during interphase, is genetically active, and stains lightly with basic dyes.

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