Blood mystery solved: Two new blood types identified

Blood mystery solved: Two new blood types identified: You probably know your blood type: A, B, AB or O. You may even know if you're Rhesus positive or negative. But how about the Langereis blood type? Or the Junior blood type? Positive or negative? Most people have never even heard of these. Yet this knowledge could be "a matter of life and death." While blood transfusion problems due to Langereis and Junior blood types are rare worldwide, several ethnic populations are at risk.