Let's suppose our individual that is receiving that blood has blood type A. And what that means is it contains antigen A on the red blood cells and it produces antibodies against antigen B. And so what that means is if a person, if the donating person has the same blood type A, then that means that person also has these red blood cells with the same type of antigen A. And so when we mix these two bloods, they will readily mix and no Agglutination actually takes place. Now what about if we mix if we donate blood from blood type B? Well, blood type B contains antigen B and forms antibodies against antigen A.