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Text replace - 'Mast Cells - WikiBlood' to 'Mast Cells'
* Antigens that induce a type I reaction are known as allergens.
* Antigens that induce a type I reaction are known as allergens.
* Generally affects face, eyes, nose and feet
* Generally affects face, eyes, nose and feet
* [[Immunoglobulin E - WikiBlood|IgE]] has a high affinity to IgE receptors on [[Mast Cells - WikiBlood|mast cells]] and [[Basophils|basophils]], and so binds these receptors.
* [[Immunoglobulin E - WikiBlood|IgE]] has a high affinity to IgE receptors on [[Mast Cells|mast cells]] and [[Basophils|basophils]], and so binds these receptors.
==Common allergens which elict a type I hypersensitivity reaction:==
==Common allergens which elict a type I hypersensitivity reaction:==
'''2. Subsequent exposure to the specific allergen (Image 2):'''
'''2. Subsequent exposure to the specific allergen (Image 2):'''
* [[Mast Cells - WikiBlood|Mast cells]] degranulate.
* [[Mast Cells|Mast cells]] degranulate.
* [[Basophils|Basophils]] with [[Immunoglobulin E - WikiBlood|IgE]] receptors are recruited and also degranulate.
* [[Basophils|Basophils]] with [[Immunoglobulin E - WikiBlood|IgE]] receptors are recruited and also degranulate.