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  2. Complement component 4 - Wikipedia

    en.wikipedia.org/wiki/Complement_component_4

    Complement component 4 (C4), in humans, is a protein involved in the intricate complement system, originating from the human leukocyte antigen (HLA) system. It serves a number of critical functions in immunity, tolerance, and autoimmunity with the other numerous components.

  3. Anaphylatoxin - Wikipedia

    en.wikipedia.org/wiki/Anaphylatoxin

    Anaphylatoxins, or complement peptides, are fragments (C3a, C4a and C5a) that are produced as part of the activation of the complement system. [2] Complement components C3, C4 and C5 are large glycoproteins that have important functions in the immune response and host defense. [3]

  4. Complement component 4B - Wikipedia

    en.wikipedia.org/wiki/Complement_component_4B

    Complement component 4B (Chido blood group) is a kind of the Complement component 4 protein that in humans is encoded by the C4B gene. [ 5 ] This gene encodes the basic form of complement factor 4, part of the classical activation pathway.

  5. C4A - Wikipedia

    en.wikipedia.org/wiki/C4A

    Complement C4-A is a kind of the Complement component 4 protein that in humans is encoded by the C4A gene. [5] Function. This gene encodes the acidic form of ...

  6. Complement system - Wikipedia

    en.wikipedia.org/wiki/Complement_system

    Scheme of the complement system. The complement system, also known as complement cascade, is a part of the humoral, innate immune system and enhances (complements) the ability of antibodies and phagocytic cells to clear microbes and damaged cells from an organism, promote inflammation, and attack the pathogen's cell membrane. [1]

  7. Complement deficiency - Wikipedia

    en.wikipedia.org/wiki/Complement_deficiency

    Complement deficiency is an immunodeficiency of absent or suboptimal functioning of one of the complement system proteins. [4] ... C4: C4 deficiency is ...

  8. Classical complement pathway - Wikipedia

    en.wikipedia.org/wiki/Classical_complement_pathway

    Complement is responsible for immune inflammatory response in adipose tissues which has been implicated in the development of obesity. [8] Obesity in turn results in an abnormally high level of complement activation via production of the C1 component of the classical pathway, which can lead to tissue inflammation and eventually insulin ...

  9. Complement receptor - Wikipedia

    en.wikipedia.org/wiki/Complement_receptor

    All four complement receptors can bind to fragments of complement component 3 or complement component 4 coated on pathogen surface, but the receptors trigger different downstream activities. [1] Complement receptor (CR) 1, 3, and 4 function as opsonins which stimulate phagocytosis, whereas CR2 is expressed only on B cells as a co-receptor.

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