The conversation between human and AI assistant.
Why do we have different blood group?
Interesting! Are there other blood group systems besides ABO?
Yes, there are over 30 different blood group systems, but the ABO and Rh systems are the most important for transfusion purposes. The Rh system is based on another antigen, called the Rh factor. People who have this antigen are Rh-positive, while those who don't have it are Rh-negative. In total, there are 8 different Rh blood groups.