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There are four basic blood types:
  • Type A with A antigen on the red cells and anti-B antibodies in the plasma.

  • Type B with B antigen on the red cells and anti-A antibodies in the plasma.

  • Type AB with both A and B antigens on the red cells and neither anti-A nor anti-B in the plasma.

  • Type O with no A or B antigens on the red cells and both anti-A and anti-B antibodies in the plasma.

If you are a Type A person, you do not carry antibodies against A markers. But you do have antibodies against Type B blood.

If you are a Type B person, you have antibodies against Type A cells.

If you are a Type O, you have antibodies against both Type A and B!

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