Assertion: start codon | /r/CapableOf | codon first aug
Facets:
value: usually
type: TEMPORAL
Source sentences:
text: When DNA is double-stranded, six possible reading frames are defined, three in the forward orientation on one strand and three reverse on the opposite strand.:330 Protein-coding frames are defined by a start codon, usually the first AUG (ATG) codon in the RNA (DNA) sequence.