and we find gen aga here it is. and here you can see a little here. that's how it's thrown out. so this is a different group . moreover, here, in addition to these antigens , there are also antigens of all of them in a circle, 342 antigens, this is important. why is it important, because look, here are four of our known blood types known to you. but this is only for the townsfolk, the first fourth group, in fact, is the presence of antigens of which antigen, huh? and antigen b and now we have your antigen. and you have the second group of antigen-b, you have the third group. and if you have both antigens this is the fourth group. according to the first group which a no antigens nor a b 0 and we already know from the existence of antibodies. that the group is the first one , is it a universal donor? she has neither a nor b. therefore, it can flow, then a + 0 b + 0 + 0 can be poured into everyone. and this is a group of universal recipience, it is not yet well before that, and the first group is well? and a, because a already exists and b is good, because b is what we are used to.