What are allergens?

Some articles on allergens, allergen:

Cat Allergy - Cat Allergens
... Five cat allergens have been described in medical literature ... The two major allergens are Fel d 1 (a secretoglobin) and Fel d 4 (a lipocalin) ... The minor allergens include Fel d 2 (an albumin), Fel d 3 (a cystatin), and cat IgA ...
Expansin - Allergenicity
... In grass pollens, the major allergens (group-1 allergens, main causative agents of hay fever and of seasonal asthma) are structurally linked to a sub-g ... These three allergens groups share a carbohydrate-binding module (CBM), which could be responsible for the binding to the IgE antibody ...
Skin Allergy Test - Process - Prick Test
... In the prick test, a few drops of the purified allergen are gently pricked on to the skin surface, usually the forearm ... Intradermal injections are done by injecting a small amount of allergen just beneath the skin surface ... skin allergy tests are also performed with proven allergens like histamine or glycerin ...
Sublingual - Allergens
... Allergens may also be applied under the tongue, and the FDA is reviewing this method of allergen immunotherapy but it is not yet approved in the US ...