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n. A double-ringed, crystalline organic base, C5H4N4, not known to occur naturally, from which is derived the nitrogen bases adenine and guanine, as well as uric acid as a metabolic end product.

n. Any of a group of organic compounds structurally related to purine, particularly adenine and guanine, and also caffeine, uric acid, theobromine, and theophylline.

n. Any of a class of organic heterocyclic base containing fused pyrimidine and imidazole rings; they are components of nucleic acids

n. any of several bases that are derivatives of purine

n. a colorless crystalline organic base containing nitrogen; the parent compound of various biologically important substances

"I started reading about Alzheimer's and tried to familiarize myself with the research, and at the same time when I was in the -- I was reading in the medical library one day, and I read this article about something called purine derivatives."

base    alkali   

guanine    uric acid    xanthine    hypoxanthine    adenine   

pyrimidine    bombesin    xenobiotic    ungraspable    discrete-time    palynomorph    multi-dimensional    nucleic    insulin-stimulated    acid-base