What I mean is most doctors don't know of this , but some do, this whole reason I started to look into tis rh neg thing is because a doctor at a prominent Los Angeles hospital after taking my sisters blood for testing told her to look it up on the Internet because you have angelic blood, she called and told me , I have o- she has ab-. So some do know,but I bey the science world knows more about this, they have to.