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Items: 11


Cyclic GMP

Guanosine cyclic 3',5'-(hydrogen phosphate). A guanine nucleotide containing one phosphate group which is esterified to the sugar moiety in both the 3'- and 5'-positions. It is a cellular regulatory agent and has been described as a second messenger. Its levels increase in response to a variety of hormones, including acetylcholine, insulin, and oxytocin and it has been found to activate specific protein kinases. (From Merck Index, 11th ed)

Year introduced: 1994



Nucleotides in which the purine or pyrimidine base is combined with ribose. (Dorland, 28th ed)

Year introduced: 1973(1971)



A series of heterocyclic compounds that are variously substituted in nature and are known also as purine bases. They include ADENINE and GUANINE, constituents of nucleic acids, as well as many alkaloids such as CAFFEINE and THEOPHYLLINE. Uric acid is the metabolic end product of purine metabolism.


Purine Nucleotides

Purines attached to a RIBOSE and a phosphate that can polymerize to form DNA and RNA.

Year introduced: 1974(1972)


Nucleotides, Cyclic

Year introduced: 1974



The monomeric units from which DNA or RNA polymers are constructed. They consist of a purine or pyrimidine base, a pentose sugar, and a phosphate group. (From King and Stansfield, A Dictionary of Genetics, 4th ed)


Nucleic Acids, Nucleotides, and Nucleosides

Complex compounds of high molecular weight occurring in living cells. These are basically of two types, ribonucleic (RNA) and deoxyribonucleic (DNA) acids, both of which consist of nucleotides (nucleoside phosphates linked together by phosphate bridges).

Year introduced: 1998


Heterocyclic Compounds, 2-Ring

A class of heterocyclic compounds that include a two-ring fused structure. Both aromatic and non-aromatic ring structures are included in this category.

Year introduced: 1998


Heterocyclic Compounds

Cyclic compounds that include atoms other than carbon in their ring structure.


Heterocyclic Compounds, Fused-Ring

Multiple ring heterocyclic compounds containing two or more rings that share two atoms and one bond in common.

Year introduced: 2017

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