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A cytological approach to the role of guanine in determining quinacrine fluorescence response in eukaryotic chromosomes

L Ferrucci and R Mezzanotte

Photooxidation is believed to preferentially remove guanine (G) residues from chromosomal DNA. G interspersion, moreover, has been hypothesized as quenching quinacrine (Q) fluorescence in cytological preparations. Hence, we used photooxidation as a tool for inducing possible changes in the Q-banding pattern of Drosophila melanogaster, Drosophila virilis, and Mus musculus metaphase chromosomes. An enhanced Q fluorescence, which was particularly evident in certain chromosomal regions, was found. This finding would support the postulated primary role of G in determining Q bands in eukaryotic chromosomes.

Volume 30, Issue 12, pp. 1289-1292, 12/01/1982
Copyright © 1982 by The Histochemical Society


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