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  1. Antibody - Wikipedia

    en.wikipedia.org/wiki/Antibody

    Each antibody binds to a specific antigen in a highly specific interaction analogous to a lock and key.. An antibody (Ab) or immunoglobulin (Ig) is a large, Y-shaped protein belonging to the immunoglobulin superfamily which is used by the immune system to identify and neutralize antigens such as bacteria and viruses, including those that cause disease.

  2. ABO blood group system - Wikipedia

    en.wikipedia.org/wiki/ABO_blood_group_system

    ABO blood group antigens present on red blood cells and IgM antibodies present in the serum. The ABO blood group system is used to denote the presence of one, both, or neither of the A and B antigens on erythrocytes (red blood cells). [1] For human blood transfusions, it is the most important of the 44 different blood type (or group ...

  3. 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. As of 2023, there are over 50 antigens among which ...

  4. What Do Antibodies Do? - AOL

    www.aol.com/antibodies-170000338.html

    Antibodies are proteins that circulate in the blood and protect against foreign antigenic substances such as bacteria, viruses, fungi, parasites, chemicals, or toxins. They are Y-shaped structures ...

  5. Blood type - Wikipedia

    en.wikipedia.org/wiki/Blood_type

    A blood type (also known as 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. 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 ...