Blood type is a classification of blood based on the presence or absence of antigens on the surface of red blood cells. ABO blood grouping is the primary blood classification system. The Rhesus (Rh) system is also commonly used in blood typing.
Blood type - Wikipedia
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Blood types (blood group)
PDF) Distribution Of Abo And Rh Blood Groups In Hiv Seropositives At An Integrated Counseling And Testing Centre In Karnataka, India
NAME DATE Student Introduction to Blood Types You
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