Tags: Protein.
Fel d 1 is a protein that in cats is encoded by the CH1 (chain 1/Fel d 1-A) and CH2 (chain 2/Fel d 1-B) genes.Fel d 1 produced largely in cat saliva and sebaceous glands is the primary allergen present on cats and kittens. The protein is of an unknown function to the animal but causes an IgG or IgE reaction in sensitive humans (either as an allergic or asthmatic response).
