| chromone | 4H-1-Benzopyran-4-one;fundamental unit of various plant pigments and other substances. See: flavone, chromene, chroman. (05 Mar 2000) |
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| chromonema | The coiled filament in which the genes are located, which extends the entire length of a chromosome and exhibits an intensely positive Feulgen test for DNA. Synonym: chromatic fibre. Origin: chromo-+ G. Nema, thread (05 Mar 2000) |