thymus-dependent antigen

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• antigen — Any substance that, as a result of coming in contact with appropriate cells, induces a state of sensitivity and/or immune responsiveness after a latent period (days to weeks) and that reacts in a demonstrable way with antibodies and/or immune… …   Medical dictionary

• interdigitating cells — antigen presenting cells found in the thymus dependent (parafollicular) areas of the deep cortex of lymph nodes and spleen, having numerous surface processes that interdigitate with adjacent lymphocytes; the surface of these cells contains an Ia… …   Medical dictionary

• immune system — Anat. a diffuse, complex network of interacting cells, cell products, and cell forming tissues that protects the body from pathogens and other foreign substances, destroys infected and malignant cells, and removes cellular debris: the system… …   Universalium

• B cell — B cells are lymphocytes that play a large role in the humoral immune response (as opposed to the cell mediated immune response, which is governed by T cells). The principal functions of B cells are to make antibodies against antigens, perform the …   Wikipedia

• poison — poisoner, n. poisonless, adj. poisonlessness, n. /poy zeuhn/, n. 1. a substance with an inherent property that tends to destroy life or impair health. 2. something harmful or pernicious, as to happiness or well being: the poison of slander. 3.… …   Universalium

• factor — 1. One of the contributing causes in any action. 2. One of the components that by multiplication makes up a number or expression. 3. SYN: gene. 4. A vitamin or other essential element. 5. An event, characteristic, or other definable entity that …   Medical dictionary

• T lymphocytes — the cells primarily responsible for cell mediated immunity; they originate from lymphoid stem cells that migrate from the bone marrow to the thymus and differentiate under the influence of the thymic hormones thymopoietin and thymosin. They are… …   Medical dictionary

• Immunosuppressive drug — For a list of immunosuppressive drugs, see the transplant rejection page .Immunosuppressive drugs, immunosuppressive agents, or immunosuppressants are drugs that inhibit or prevent activity of the immune system. They are used in immunosuppressive …   Wikipedia

• lymphocyte — A white blood cell formed in lymphatic tissue throughout the body ( e.g., lymph node s, spleen, thymus, tonsils, Peyer patches, and sometimes in bone marrow) and in …   Medical dictionary

• B cell — A type of white blood cell and, specifically, a type of lymphocyte. Many B cells mature into what are called plasma cells that produce antibodies (proteins) necessary to fight off infections while other B cells mature into memory B cells. All of… …   Medical dictionary

• Td — Adult diphtheria and tetanus toxoids. See Td immunization. * * * tabes dorsalis; tardive dyskinesia; T cell dependent [antigen]; temporal embedding dimension; temporary disability; terminal device; tetanus and diphtheria [toxoid]; tetrodotoxin;… …   Medical dictionary