Dictionary![]() ![]() chro•ma•tinPronunciation: (krō'mu-tin), [key] —n. Cell Biol. the readily stainable substance of a cell nucleus, consisting of DNA, RNA, and various proteins, that forms chromosomes during cell division. See diag. under cell. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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