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gua·nine (gwä'nēn')
n. (Abbr. G)
A purine base, C5H5ON5, that is an essential constituent of both RNA and DNA.

[From GUANO, in which it is found.]


logo The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.

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