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BOOK SUMMARY :

The term human blood group systems is defined by international society of blood transfusion as systems in the human species where cell surface antigensin particular those on blood cellsare controlled at a single gene locus or by two or more very closely linked homologous genes with little or no observable recombination between them and include the common abo and rh rhesus antigen the most well known and medically important blood types are in the abo group they were discovered in 1900 and 1901 at the university of vienna by karl landsteiner in the process of trying to learn why blood transfusions sometimes cause death and at other times save a patientblood types depend on the content of the blood cells and are inherited from parents there are eight common blood types and receiving a donation of each affects the immune system in a different later jan jansky described classification of human blood groups of four types blood groups at present 33 blood group systems representing over 300 antigens are listed by the international society of blood transfusion23 most of them have been cloned and sequenced the genes of these blood group systems are autosomal except xg and xk when a persons blood is analyzed under a microscope distinct blood differences are visible in the early 20th century an austrian scientist named karl landsteiner classified blood according to those differences landsteiner observed two distinct chemical molecules present on the surface of the red

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