In the individual who has the BType, they have the B antigen. And in the individual who has the AB, they have both A and B antigens. Now this is the protein component of the glycoprotein, the antigen. And notice the protein component is exactly the same in each one of these cases. In fact, we also have these carbohydrates attached onto the protein component and that's what makes them glycoproteins. And notice that all these three antigens have a common sequence in common.