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  2. Human blood group systems - Wikipedia

    en.wikipedia.org/wiki/Human_blood_group_systems

    The term human blood group systems is defined by the International Society of Blood Transfusion (ISBT) as systems in the human species where cell-surface antigens—in particular, those on blood cells—are "controlled at a single gene locus or by two or more very closely linked homologous genes with little or no observable recombination between them", [1] and include the common ABO and Rh ...

  3. Blood type - Wikipedia

    en.wikipedia.org/wiki/Blood_type

    A complete blood type would describe each of the 45 blood groups, and an individual's blood type is one of many possible combinations of blood-group antigens. [3] Almost always, an individual has the same blood group for life, but very rarely an individual's blood type changes through addition or suppression of an antigen in infection, malignancy, or autoimmune disease.

  4. ABO blood group system - Wikipedia

    en.wikipedia.org/wiki/ABO_blood_group_system

    For human blood transfusions, it is the most important of the 44 different blood type (or group) classification systems currently recognized by the International Society of Blood Transfusions (ISBT) as of December 2022.

  5. Blood type distribution by country - Wikipedia

    en.wikipedia.org/wiki/Blood_type_distribution_by...

    Blood type (also called a blood group) is a classification of blood, based on the presence and absence of antibodies and inherited antigenic substances on the surface of red blood cells (RBCs). These antigens may be proteins, carbohydrates, glycoproteins, or glycolipids, depending on the blood group system.

  6. Rh blood group system - Wikipedia

    en.wikipedia.org/wiki/Rh_blood_group_system

    The Rh blood group system is a human blood group system. It contains proteins on the surface of red blood cells. After the ABO blood group system, it is the most likely to be involved in transfusion reactions. The Rh blood group system consisted of 49 defined blood group antigens [1] in 2005.

  7. MNS antigen system - Wikipedia

    en.wikipedia.org/wiki/MNS_antigen_system

    The blood type is due to a glycoprotein present on the surface of a red blood cell (RBC), which behaves as a native antigen. Phenotypic expression at this locus is codominant because an individual may exhibit either one or both antigenic substances. Frequencies of the two alleles vary widely among human populations. [5]

  8. Blood - Wikipedia

    en.wikipedia.org/wiki/Blood

    Blood for transfusion is obtained from human donors by blood donation and stored in a blood bank. There are many different blood types in humans, the ABO blood group system , and the Rhesus blood group system being the most important.

  9. ABO (gene) - Wikipedia

    en.wikipedia.org/wiki/ABO_(gene)

    Histo-blood group ABO system transferase is an enzyme with glycosyltransferase activity, which is encoded by the ABO gene in humans. [5] [6] It is ubiquitously expressed in many tissues and cell types. [7] ABO determines the ABO blood group of an individual by modifying the oligosaccharides on cell surface glycoproteins. Variations in the ...