Assertion: cytosine | /r/HasProperty | combined with ribose
Facets:
Source sentences:
text: (A ribonucleoside is composed of one of the four RNA bases, gua- nine, cytosine, uracil, or adenine combined with ribose; this plus three phos- phate groups makes a ribonucleoside triphosphate; a nucleotide is a nucleo- side plus one phosphate group.)