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• Immunology Terms

- T -

• T cell

A lymphocyte which undergoes a developmental stage in the thymus.



• T-dependent antigen

An immunogen that is able to induce antibody synthesis only in the presence of lymphokines released by helper T cells.



• T-independent antigen

An immunogen which induces antibody synthesis in the absence of lymphokines released by T cells; the antibodies are generally only of the IgM isotype.



• Titre

The reciprocal of the last dilution of a titration giving a measurable effect; e.g. if the last dilution giving significant agglutination is 1:128, the titre is 128.



• Tolerance

Diminished or absent capacity to make a specific response to an antigen, usually produced as a result of contact with that antigen under nonimmunizing conditions.



• Toxoid

A nontoxic derivative of a toxin used as an immunogen for the induction of antibodies capable of cross-reacting with the toxin.