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 ...

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

Red blood cells are complex — there's much more to blood types than A, B and O. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Many people know ...