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... Adhesion molecules are not activated until the TcR is bound to an antigen. Costimulatory Molecules: Eg: CD28, CD40L. Also known as the second signal. Essential for proper activation of T cells. Without 2nd signal  anergy.  CD28 is present on essentially all T cells and binds to B7 found on APCs.  ...
Lecture 11- Immunity 2
Lecture 11- Immunity 2

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Chapter 43 - FacStaff Home Page for CBU
Chapter 43 - FacStaff Home Page for CBU

... Immune responses and immunological memory Antigens cause the lymphocytes to form two clones of cells: effector cells and memory cells. 1. Antigen molecules bind to the antigen receptors of a B cell. 2. The selected B cell multiplies and gives rise to a clone of identical cells bearing receptors for ...
Lymphatic & Immune Systems
Lymphatic & Immune Systems

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... that do not produce IL-2. EBV produces an analog of IL-10 that favors TH2 cells, rather than TH1. Parasites such as tape worms induce high levels of IgE, an immunoglobulin induced by TH2 cells. Since TH1 cells mediate inflammation, this may be a protective ploy to avoid destructive inflammatory ...
Active and passive immunity IGCSE
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... in more detail, initially by writing them on long strips of paper niques. Several investigators have replaced CDRs of human antibodies with those of mouse monoclonal antibodies with and later by using computers. We reasoned that the variable region of light chains ofimmunoglobulins could have random ...
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"Autoimmune Disease: Pathogenesis".

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Gender differences wrt immune responses
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... • estrogen is capable of triggering SLE-like autoimmunity (mice) • Additionally, androgens such as testosterone clearly play an important role in some autoimmune diseases • Female NOD mice are much more susceptible to spontaneous ...
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... A subtype of idiopathic generalized epilepsy characterized by onset at age 6-7 years, frequent absence seizures (several per day) and bilateral, synchronous, symmetric 3-Hz spike waves on EEG. During adolescence, tonic-clonic and myoclonic seizures may develop. Absence seizures may either remit or p ...
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Polyclonal B cell response



Polyclonal B cell response is a natural mode of immune response exhibited by the adaptive immune system of mammals. It ensures that a single antigen is recognized and attacked through its overlapping parts, called epitopes, by multiple clones of B cell.In the course of normal immune response, parts of pathogens (e.g. bacteria) are recognized by the immune system as foreign (non-self), and eliminated or effectively neutralized to reduce their potential damage. Such a recognizable substance is called an antigen. The immune system may respond in multiple ways to an antigen; a key feature of this response is the production of antibodies by B cells (or B lymphocytes) involving an arm of the immune system known as humoral immunity. The antibodies are soluble and do not require direct cell-to-cell contact between the pathogen and the B-cell to function.Antigens can be large and complex substances, and any single antibody can only bind to a small, specific area on the antigen. Consequently, an effective immune response often involves the production of many different antibodies by many different B cells against the same antigen. Hence the term ""polyclonal"", which derives from the words poly, meaning many, and clones (""Klon""=Greek for sprout or twig); a clone is a group of cells arising from a common ""mother"" cell. The antibodies thus produced in a polyclonal response are known as polyclonal antibodies. The heterogeneous polyclonal antibodies are distinct from monoclonal antibody molecules, which are identical and react against a single epitope only, i.e., are more specific.Although the polyclonal response confers advantages on the immune system, in particular, greater probability of reacting against pathogens, it also increases chances of developing certain autoimmune diseases resulting from the reaction of the immune system against native molecules produced within the host.
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