Doctors call this the ABO Blood Group System. The third kind of antigen is called the Rh factor. You either have this antigen (meaning your blood type is “Rh+” or “positive”), or you don ...

Researchers from the UK and Israel have identified a new blood group system in humans, marking a major breakthrough in hematology. The discovery, published in September, stems from a puzzling case ...

A Decades-long Medical Mystery The origins of the MAL blood group trace back to an anomaly involving the AnWj antigen, a molecular marker present on the red blood cells of more than 99.9% of ...