Fel D 1
Most human cat allergies are caused by Fel d 1. Allerca (and earlier, Geneticas) scientists tried to delete or disable the gene. The company now says it has "discovered" a breed of cats that had a mutant version of the protein that did not induce an allergic response. Since a number of Fel d 1 alleles are known and documented whereas it is presently impossible to deduce allergenicity from their DNA or protein sequence alone, the alleged mutant cats could in fact exist, but their hypoallergenicity cannot be considered proven for the time being.
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