Well, to demonstrate what that means, let's take a look at the Abo blood type that exists inside our body. So let's remember a bit of biology. So any individual either has blood type O, blood type A, blood type B, or blood type AB. So what exactly differentiates one blood type from another blood type? So essentially, on the membranes of our red blood cells, there are specific antigens, more specifically specific glycoproteins that are expressed and it's the type of glycoprotein on the cell membrane of the red blood cell that determines your blood type group. So let's take a look at the following three diagrams.