And that's because if, let's say our person has type O red blood cells, that means they produce both antibodies against antigen A and antigen B. And by donating a B or AB to this person with blood type O, that means the blood type O person will have antibodies that will kill off all these different red blood cells, AB and AB. And only this one, the blood type O donator, will not have the red blood cells with either of these antigens. And so the antibodies will not affect that person. So you can examine this table in more detail to basically convince yourself that this transfusion system actually works. Now, the final thing I'd like to briefly talk about is the type of genotypes that form the different types of blood types.