Assertion: adenine | /r/HasProperty | replaced by u - uracil
Facets:
value: in rna
type: LOCATION
value: in c - cytosine
type: OTHER
value: in g - guanine
type: LOCATION
Source sentences:
text: There are 64 DNA codons (possible sequences of the 3-letter nucleotide bases A - adenine, T - thymine, which is replaced by U - uracil in RNA, C - cytosine and G - guanine) but only 20 possible amino acids because of the possibility of mutations that would replace one nucleotide base with another.