#purine.base any of several bases that are derivatives of purine
supertype: #base__alkali any of various water-soluble compounds capable of turning litmus blue and reacting with an acid to form a salt and water; "bases include oxides and hydroxides of metals and ammonia"
subtype: #adenine (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA
subtype: #guanine a purine base found in DNA and RNA; pairs with cytosine
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