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The universal blood donor specifically belongs to the blood group O negative (O-). This is because O negative blood can be given to individuals of any blood type without causing an immune reaction.

O positive (O+) blood is not considered universal for all recipients because it can only be safely given to individuals with any positive Rh factor blood type (A+, B+, AB+, O+). However, O positive is the most common blood type and is often used in emergencies where the Rh factor of the recipient is known to be positive.

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