Assertion: antigen | /r/HasProperty | allergen
Facets:
Source sentences:
text: This antibody is made inappropriately in individuals with allergies and asthma -- it can bind to mast cells via Fc receptors (Fc-IgE receptors) and can launch life-threatening inflammatory responses when matching antigen (allergen) is present.
text: They can also be substances, called allergens, that bring on an allergic reaction.