The rarest blood type is AB negative, which is found in less than 1% of the world's population. This blood type is considered rare because it has a unique combination of antigens that are not found in any other blood type. AB negative blood is also the universal plasma donor, which means that it can be given to people with any blood type in an emergency situation. However, people with AB negative blood can only receive blood from donors with the same blood type, which can make it difficult to find compatible blood in a medical emergency.
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