And since this produces antigen B's, antibody B, the antibody B will bind onto a B red blood cells, destroying those red blood cells, forming this Agglutination process. And so this and this is not allowed. But if we take an O individual and we donate blood from the O individual to an A because the O individual doesn't have either antigen A or antigen B, what that means is the antibody against antigen B that this individual blood type A has will not be able to bind to the red blood cells of type O person. And so this process of mixing will take place. Now, notice one important point about blood type O. If we examine this entire column, we have, yes, all the way down.