And this type of blood group is known as blood group AB. So an individual that has blood group AB, what that means is they have both of these alleles that code for these two proteins. Now, what about this particular case? Well, in this particular case, in this case, both of those chromosomes contain one of these alleles each. And so the only type of protein that will be expressed is protein B. In this case, one of the alleles doesn't code for anything and the other allele codes for protein B.