Assertion: purine | /r/HasProperty | guanine
Facets:
Source sentences:
text: The two purines are adenine and guanine, and the three pyrimidines are cytosine, thymine and uracil.
text: DNA contains two purines, called adenine and guanine, as well as two pyrimidines, thymine and cytosine.
text: In DNA, the pyrimidines are thymine and cytosine; the purines are adenine and guanine.