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Why do people have different blood types? | Ask Dr. Universe

 

September 6, 2017



Dr. Universe,

Why are there different blood types?

– Sarah, Tacoma, Washington

Dear Sarah,

At this very moment, several quarts of blood are circulating through your body at nearly 4 mph. But, as you’ve pointed out, not everyone’s blood is the same.

Your question made me wonder exactly what we mean when we talk about blood types. I decided to ask my friend Amber Fyfe-Johnson, a researcher at Washington State University who studies blood diseases in kids.

Believe it or not, she said, there are more than 20 different blood groups. We’ll stick to the main...



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