Assertion: antigen's epitope | /r/DefinedAs | one single amino acid
Facets:
value: at one position
type: TEMPORAL
Source sentences:
text: Unlike class I epitopes, the 60 HLA class IIB1 epitopes were defined based solely on amino acid sequence of the DR antigen beta chain where all epitopes can be defined by one single amino acid at one position (Table 6).