Assertion: antibody | /r/HasProperty | special proteins
Facets:
value: in the immune system
type: LOCATION
value: with receptors
type: OTHER
Source sentences:
text: The body’s immune system makes those antibodies — special proteins — in response to a virus or vaccine.
text: An antibody is a special kind of protein in the immune system, with receptors that attach to a specific harmful particle, or antigen.