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Which blood type is known as the universal red-cell donor? Answer with the blood type only, e.g. AB+.

Answer

O-
blood type notation
O- denotes group O, RhD-negative; the answer is the UTF-8 text O- right-padded with zero bytes to bytes32.
sources
www.redcrossblood.org, american red cross (redcrossblood.org): o negative red blood cells are the universal red-cell donor type, american red cross - blood types (redcrossblood.org/donate-blood/blood-types.html): 'o negative red blood cells are the safest to give to anyone in a life-threatening emergency... universal donor', american red cross blood types explained: https://prod-www.redcrossblood.org/donate-blood/blood-types.html, american red cross, 'blood types' (redcrossblood.org) — o negative is described as the universal red-cell donor type, compatible with all abo/rh blood types, american red cross, 'blood types' (redcrossblood.org/donate-blood/blood-types.html): 'o negative blood is the universal blood type... it is the only blood type that can be safely given to anyone.', american red cross, 'blood types' (redcrossblood.org/donate-blood/blood-types.html): 'o negative blood is the universal red cell donor type.', american red cross, 'blood types' (redcrossblood.org/donate-blood/blood-types.html): 'o negative red blood cells are the safest to give to anyone in a life-threatening emergency ... universal donor', american red cross, 'blood types' (redcrossblood.org/donate-blood/blood-types.html): 'o negative red blood cells are the safest to give to anyone in a life-threatening emergency... makes it the universal blood donor.', american red cross, 'blood types' (redcrossblood.org/donate-blood/blood-types.html): 'type o negative blood is the universal red cell donor type.', american red cross, 'blood types' (redcrossblood.org/donate-blood/blood-types.html): 'type o negative red blood cells are the safest to give to anyone in an emergency or when there's a limited supply of the specific blood type needed, which is why it's often called the universal blood donor.', american red cross, 'blood types' (redcrossblood.org/donate-blood/blood-types.html): o negative red blood cells are the universal red-cell donor type, compatible with all abo/rh blood types., american red cross, 'blood types' (redcrossblood.org/donate-blood/blood-types.html): o negative red blood cells are the universal red-cell donor type, compatible with all abo/rh types., american red cross, 'blood types' (redcrossblood.org/donate-blood/blood-types.html); aabb technical manual, blood group compatibility chapter, american red cross, blood types and the blood supply, https://www.redcrossblood.org/donate-blood/blood-types.html (o negative described as the universal red cell donor), american red cross, blood types and transfusion: https://www.redcrossblood.org/donate-blood/blood-types.html (states the universal red-cell donor has type o negative); nhs blood and transplant, blood donation key messages and information: https://www.nhsbt.nhs.uk/how-you-can-help/get-involved/key-messages-and-information/blood-donation-key-messages-and-information/ (describes o negative red cells as universal)., en.wikipedia.org, prod-www.redcrossblood.org

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