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purine

purine, type of organic base found in the nucleotides and nucleic acids of plant and animal tissue. The German chemist Emil Fischer did much of the basic work on purines and introduced the term into the chemical literature in the early 20th cent. The two major purines of almost universal distribution in living systems are adenine and guanine.

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purine

purine An organic nitrogenous base (see formula), sparingly soluble in water, that gives rise to a group of biologically important derivatives, notably adenine and guanine, which occur in nucleotides and nucleic acids (DNA and RNA).

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purine

purine A basic, nitrogenous compound that resembles a six-membered pyrimidine ring fused to a five-membered imidazole ring. The two principal purines, adenine and guanine, are major constituents of nucleic acids.

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purine

purine A basic nitrogenous compound that resembles a 6-membered pyrimidine ring fused to a 5-membered imidazole ring. The 2 principal purines, adenine and guanine, are major constituents of nucleic acids.

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purine

purine A nitrogen base composed of two adjoining ring structures, one of which has five members and the other six. The purine bases in the nucleotides of nucleic acids are adenine and guanine.

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purine

purine (pewr-reen) n. a nitrogenous compound with a two-ring molecular structure. Examples of purines are adenine and guanine, which occur in nucleic acids, and uric acid.

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