Assertion: cytosine's pair | /r/CapableOf | pair up with cytosine
Facets:
value: always
type: DEGREE
value: across the centre of the dna
type: LOCATION
Source sentences:
text: Across the centre of the DNA double helix:Adenine (A) always pairs up with Thymine (T);Guanine (G) always pairs up with Cytosine (C).This purine-pyrimidine pairing ensures that the rungs of the DNA ladder are the same length.