Assertion: vaccine's antigen | /r/HasProperty | substance
Facets:
value: on the surface of cells
type: LOCATION
Source sentences:
text: The study looked at the number of antigens (substances in vaccines that cause the body’s immune system to produce disease-fighting antibodies) from vaccines during the first two years of life.
text: Antigens are substances on the surface of cells that are not normally part of the body.
text: Antigens are substances, often a protein, that stimulate the body to produce an immune response to protect itself against attacks from future actual disease exposure.