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American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Biochemistry) a nucleotide consisting of guanine, ribose or deoxyribose, and a phosphate group. It is a constituent of DNA or RNA. Also called: guanosine monophosphate
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