- guanosine triphosphate: an ester of guanosine and triphosphoric acid that is an important metabolic cofactor and precursor in the biosynthesis of cyclic GMP.
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- Guanosine triphosphate; a nucleotide similar to ATP, composed of guanine, ribose, and three phosphate groups, and necessary for the synthesis of proteins.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.