> Everything you're allergic to is something you were exposed to at least once; your immune system has to see it and learn to recognize it before you can react to it.
Is this true? From a biochemistry perspective, it doesn't seem like it's necessarily true. Allergies could be genetic, in which case a genetic mutation results in the phenotype where an immune system mis-identifies allergens as harmful.
Is this true? From a biochemistry perspective, it doesn't seem like it's necessarily true. Allergies could be genetic, in which case a genetic mutation results in the phenotype where an immune system mis-identifies allergens as harmful.