May be involved in disease resistance. Causes an oral allergy syndrome (OAS) reaction in human and animals (PubMed:17441795, PubMed:22749702, PubMed:26433527). Binds to IgE and induces the release of histamine from leukocytes of allergic patients (PubMed:17441795). Binds to IgE from canine atopic dermatitis (CAD) sensitive dogs (PubMed:22749702). Belongs to the thaumatin family.