Linked from
The 27 pages that link to Purine, each with the reason it gives.
CaffeineRelated: Caffeine’s molecular structure is based on a purine ring system.
NucleosideRelated: A purine base forms the base component of purine nucleosides.
Base pairRelated: Purines pair with single-ring pyrimidines in canonical DNA and RNA pairs.
FormamideRelated: Formamide can act as a one-carbon and nitrogen source in purine synthesis.