Assertion: antigen | /r/HasProperty | a string of keys
Facets:
Source sentences:
text: Using the "lock and key" metaphor, the antigen can be seen as a string of keys (epitopes) each of which matches a different lock (antibody).
text: Using the "lock and key" metaphor, the antigen can be seen as a string of keys (epitopes) each of which matches a different lock (antibody).
text: Using the “lock and key” metaphor, the antigen itself can be seen as a string of keys –