My muddiest point for this unit is recognizing the antigens and antibodies reactions involved in transfusion reactions and predict which type of blood (ABO system) can be the recipient and donor in transfusion. I am kind of confused how you figure that out.
A,B,AB, and O are different blood types which are determineed by antigens (all these blood types have different antigens; blood type O does not have any antigens). O can donate to all blood types; AB can reeive blood from anyone.
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