Feline leukemia virus is the most common cause of cancer in cats, it may cause various blood disorders, and it may lead to a state of immune deficiency that. 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. It's not your cat's fault that you are allergic to it. Most cat allergies result from a reaction to the Fel d 1 glycoprotein, which cats secrete through their skin and.
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