General
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• Aka Duffy blood group antigen (Fy glycoprotein); erythrocyte chemokine receptor, Duffy Antigen Receptor for Chemokines (DARC)
• RBC receptor for Plasmodium vivax, a malarial parasite
• Negativity associated with sickle cell trait, due to common protection against malaria provided by both traits African-Americans often Duffy negative and resistant to P. vivax malaria

Positive staining (normal)
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• Endothelial cells of post-capillary venules, Purkinje cells of cerebellum

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