The blood type B carries anti-A antibodies in the plasma. Blood type B is characterized by the presence of B antigens in the plasma membrane of the red blood cells. With the B antigens present, the opposite (anti-A) antibodies should be present in the plasma. Same goes with other blood types. In blood type A, there is the presence of A antigens on the RBC membrane and anti-B antibodies in the plasma. In blood type O, there are no antigens on the RBC membrane therefore there is the presence of both anti-A and anti-B antibodies in the plasma. In blood type AB, there are both the A and B antigens on the RBC membrane but no antibodies in the plasma.
