Human blood already comes in a bewildering variety of types, but researchers have now identified a new one so rare that only ...

Although, of course, the fact that only a select few have it is impressive. It is distinguished by the fact that it does not contain antigens, meaning that it is neither negative nor positive. Such ...

Blood type A(B) is caused by a four gene mutations and was discovered when the blood of patients and donors was being studied in a Thai hospital.