Assertion: immune system's cell | /r/HasProperty | foreign
Facets:
Source sentences:
text: Your immune system builds up antibodies to the foreign cells it finds in the vaccine and will quickly remember these foreign cells and destroy them if you are exposed to them in the future.
text: Activation of naïve helper T cells occurs when antigen-presenting cells (APCs) present foreign antigen via MHC class II molecules on their cell surface.
text: In these cases, in addition to an increased susceptibility to infection, people with primary immunodeficiencies may also have autoimmune diseases in which the immune system attacks their own cells or tissues as if these cells were foreign, or non-self.