Assertion: allergy's system | /r/CapableOf | become sensitive
Facets:
value: to particular antigens
type: TRANSITIVE-OBJECT
value: to substances
type: OTHER
Source sentences:
text: This happens when their immune systems become sensitive to substances present in their surroundings.
text: Allergies tend to become worse as the season progresses because the immune system becomes sensitized to particular antigens and can produce a faster, stronger response.