allergen

External substance which can cause allergies (hypersensitivity of the immune system).
Classifications:

• animal allergens (e.g. beef protein, chicken protein)
• plant allergens (e.g. pollen, wheat, nuts)
• chemical allergens (e.g. amalgam, cosmetics)

There are presently around 20,000 known allergens, most of which are proteins.
See also: allergen labeling

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