Short answer is we probably don’t know what will happen. Long answer: We probably lost the enzyme activity during a fight with some pathogen. The truncated pro

Short answer is we probably don’t know what will happen. Long answer: We probably lost the enzyme activity during a fight with some pathogen. The truncated protein is still produced, and there are effects in the body if that is removed. So, putting it back (under the same expression programming) might do nothing bad, or it might break all the other hacks we’ve accumulated since we first lost the enzyme, or it might not protect against this allergy, or we might be more susceptible to some bacterial beastie that we should really mount immune responses to. Don’t think anyone has tried activating it again in any animal/model system.