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Fel d 1 is a secretoglobin protein complex that, in cats, is encoded by the CH1 (chain 1/Fel d 1-A) and CH2 (chain 2/Fel d 1-B) genes. [2] [3] Among cats, Fel d 1 is produced largely in their saliva and by the sebaceous glands located in their skin. It is the primary allergen present on cats and kittens.
Fel d 1 is the most prominent cat allergen, accounting for 96% of human cat allergies. [4] The remaining cat allergens are Fel d 2–8, [5] with Fel d 4, a major urinary protein found in the saliva of cats, [6] occurring the most in humans among the other seven allergens. All cats produce Fel d 1, including hypoallergenic cats.
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Fel d1 is a protein primarily found in cat saliva and sebaceous glands. [17] Those with cat allergies may react to direct contact with Sphynx cats. [ 17 ] Even though reports exist that some people with allergies successfully tolerate Sphynx cats, they are fewer than those who have allergic reactions.
"The Russian Blue produces less glycoprotein Fel d 1 and is much less of an allergen source than other breeds of cat," should either be properly cited or removed. I have found several web sites that either parrot or paraphrase this "fact," but I've found nothing from a published source.
Slow loris brachial gland exudate (BGE) has been shown to possess up to 142 volatile components, and possesses a variant of the cat allergen protein Fel-D1. The BGE has several ecological functions including anti-parasitic defence [24] and communication.
In chickens, immunoglobulin Y is the functional equivalent to Immunoglobulin G (IgG). Like IgG, it is composed of two light and two heavy chains. Structurally, these two types of immunoglobulin differ primarily in the heavy chains, which in IgY have a molecular mass of about 65,100 atomic mass units (amu), and are thus larger than in IgG.
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