Blood types classify blood so healthcare providers can determine whether one person’s blood is compatible with another’s. Blood types include A, B, AB and O.
Yikes: Your Blood Type Might Put You at Risk for These Diseases
Type O Blood
Rarest blood type: Chart and compatibility
Secrets Your Blood Type Reveals About You
Blood type - Wikipedia
Blood type and genetics may determine your odds of contracting the
Blood type - Wikipedia
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A new understanding of how your blood type influences your health
Blood types
How to Find Out Your Blood Type: Home Testing & More