purine(redirected from Purin)
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pur·ine (Pur),(pyūr'ēn, -rin),
The parent substance of adenine, guanine, and other naturally occurring purine "bases."
1. A double-ringed, crystalline organic base, C5H4N4, that is the parent compound of a large group of biologically important compounds.
2. Any of a group of substituted derivatives of purine, including the nitrogen bases adenine and guanine, which are components of nucleic acids. Uric acid, caffeine, theobromine, and theophylline are also purines.
The parent substance of adenine, guanine, and other naturally occurring so-called purine bases; not known to exist as such in mammals.
purineone of two types of base found in NUCLEIC ACIDS, having a double ring structure; see ADENINE and GUANINE. Purines always pair with PYRIMIDINES in the two strands of DNA, ensuring a parallel-sided molecule.
A white crystalline substance that is one of the building blocks of DNA. Uric acid is produced when purine is broken down in the body.