Assertion: cytosine | /r/HasAspect | only one ring
Facets:
value: in its structure
type: LOCATION
Source sentences:
text: Cytosine is a pyrimidine; it has only one ring in its structure.
text: Inc. The four nucleotides of DNA are grouped into two "families" based on their chemical structure: the purines, adenine and guanine, have a structure with two rings; and the pyrimidines, cytosine and thymine, have only one ring (Figure 6).
text: Note that guanine and adenine, the purines, have two rings, while cytosine and thymine, the pyrimidines, have only one ring.