Which breed of cat does not give allergy problems?

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I've kept cats in the past and am missing them. However I used to have some problems as my son turned out to be mildly allergic to pet hair. I have heard of one breed of cat that people do not develop allergy problems with. I gather that the problems caused to people that are allergic are linked to a substance normally present in the saliva of cats. But this breed does not have the same saliva patterns. Can anyone tell me the name of the breed, and if so do they have any personal experience of keeping this kind of cat?