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Antigens in Biological Definition

Antibody

... of the monomer. The two variable domains bind the antigens they are specific for and that elicited their ... The ability to bind a wide variety of foreign antigens arises from events know as somatic recombination. ... human immune system is capable of binding so many antigens is the variable region of the heavy chain. More ...

Antigen

... injected or comes into contact with skin. antigens are presented by a cell to its environment via a ... can leap into action. We can also classify antigens according to where they come from: Exogenous antigens ...

Blood type

... ABO and Rh factor . There are 46 other known antigens , most of which are much rarer than ABO and Rh. ... blood types along with their respective antigens and antibodies : Individuals with type A ... Type AB people have red blood cells with both antigens A and B, and do not produce antibodies against ...

T cell

... to destroy target cells which express specific antigens that they recognize. Helper T cells (CD4 + ... . CD4 and CD8 refer to the characteristic antigens on the surface of the different sub-types of ... where they get presented with self and foreign antigens in a complex with type I and type II MHC ...

Immunology

... of classical immunology has been the interaction between antibodies and antigens . Without an understanding of the properties of these two biological ... disease ), and autoimmunity , in which the immune system attacks its own antigens (examples include systemic lupus erythematosus , rheumatoid arthritis , ...

Major histocompatibility complex

... peptides. Foreign peptides that provoke an immune response are termed antigens . Interestingly, the immune system has another, equally important method ... B cell receptors (BCRs). However, while the BCRs of B cells can bind to antigens without much outside help, the TCRs of T cells require "presentation" of ...

Antigenic shift

... Antigenic shift is the process by which two different strains of influenza combine to form a new subtype having a mixture of the surface antigens of the two original strains. Because the human immune system has difficulty recognizing the new influenza strain, it may be highly dangerous. ...

Apoptosis

... In order to carry out their job, B and T cells must have the ability to discriminate "self" from "nonself", and "healthy" from "unhealthy" antigens (protein segments that make a good fit, like a key and a lock, with specialized receptors in B and T cell membranes). For instance, "killer" T cells ...

B cell

... lymph, but are not producing antibodies. There are two types of B cells: Plasma B cells secrete antibodies which effect the destruction of antigens by binding to them and making them easier targets for phagocytes . Memory B cells are formed specific to the antigen(s) encountered during ...

Chromatography

... of proteins (or better: protein constructs). These constructs can be of fusion proteins with a so-called his-tag , biotinylated or possibly antigens . After purification some of these tags are usually removed and the pure protein is obtained. See also Paper chromatography of amino ...

Cytotoxic T cell

... (or T C ) T cell is a T cell (a type of white blood cell ) which has on its surface antigen receptors that can bind to fragments of antigens displayed by the Class I MHC molecules of virus infected somatic cells and tumor cells. Once activated by a MHC-antigen complex, T C cells ...

Glycoprotein

... mammals . Examples of glycoproteins in the immune system are: molecules such as antibodies (immunoglobulins) which interact directly with antigens molecules of the major histocompatibility complex (or MHC), which are expressed on the surface of cells and interact with T-cells as part of ...

Helper T cell

... helper (or T H ) T cell is a T cell (a type of white blood cell ) which has on its surface antigen receptors that can bind to fragments of antigens displayed by the Class II MHC molecules found on professional antigen-presenting cells (APCs). Once bound to an antigen, the T H cell ...

Paternity testing

... three individuals, although older methods have included ABO blood group typing , analysis of various other proteins and enzymes , or using HLA antigens . For the most part however, DNA has all but taken over all the other forms of testing. The DNA of an individual is almost exactly the same in ...

Semen

... antibodies were produced in humans in response to the sperm. These antibodies mistakenly recognized native T lymphocytes as foreign antigens , and consequently the T lymphyocytes would fall under attack by the body's B lymphocytes . Other semen components shown to spur an ...
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