What cat food can i feed my cat who has a chicken allergy?

I believe my cat has a chicken allergy, she plucks the fur on her back near her tail, it can get very bad. Vet said it was a protien that she is allergic to. I have been to vets about this, so i know it is an allergy not anything else. I am pretty sure she is not allergic to fish, only almost every cat food i look at has "chicken mean" "chicken by-product" and other chicken stuff in it. I need something without ANY chicken. Help, any ideas are ideas i will look into.