BLOOD TYPES - ABO and Rh Blood Group Systems

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What does it mean to have a RH Negative blood type? (ALIEN DNA?)

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Rh “Rhesus” Blood Types - Are you positive or negative?! - Hematology

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Blood 8, Blood groups, Genetics of Rhesus factor

The Genetics of Blood Types

Blood Types Explained | Blood Groups (ABO) and Rh Factor Nursing Transfusions Compatibility

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Rhesus factor (D)

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Blood Types (ABO and Rh) - Antigens and Antibodies

Rhesus factor