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For relevance on how rare it is, there are only 43 known people of that have it. They have to donate their blood to themselves when they’re healthy every year, so they have it, if they need it.
Rh-null. So rare they can almost never receive a transfusion.
For relevance on how rare it is, there are only 43 known people of that have it. They have to donate their blood to themselves when they’re healthy every year, so they have it, if they need it.