 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 exist, but their hypoallergenicity has not been proven.Lifestyle Pets never submitted their scientific claims for peer review.