The letters A, B and O represent various forms of the ABO gene, which program our blood cells differently to form the different blood groups. If you have type AB blood, for example, your body is ...

New York Blood Center has issued an urgent call for blood donations, especially from those with types O+ and O- blood. The current supply of O- blood, the universal blood type used in emergencies ...

See at Cnet. What does your blood type mean for your body? The letters A, B and O represent various forms of the ABO gene, ...