The ABO blood group system is the most important blood type classification system for humans. Simply put, the labels O, A, B, and AB indicate whether the antigens A and B are present on the red
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Blood Group Basics - Irish Blood Transfusion Service
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Blood - European Commission
Blood type distribution by country in Europe - Map : r/europe
Are black people simply physiologically more susceptible to COVID-19 infection, or are there other factors? - Quora
Blood types - NHS Blood Donation
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Chart: How Blood Type Prevalence Varies Around the World