Ovomucoid is a protein found in . It is a trypsin inhibitor with three of the Kazal domain protein family. The homologs from ( Gallus gallus) and especially turkeys ( Meleagris gallopavo) are best characterized. It is not related to the similarly named ovomucin, another egg white protein.
Chicken ovomucoid, also known as Gal d 1, is a known allergen. It is the protein most often causing egg allergy. At least four IgE have been identified. Three other egg white proteins are also identified as allergenic: ovalbumin (Gal d 2), ovotransferrin (Gal d 3) and lysozyme (Gal d 4).
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