(Science: immunology) Any toxin that is conjugated to either an immunoglobulin or fab fragment directed against a specified antigen. Thus if the antigen is borne by a particular type of cell, such as a tumour cell, the toxin may be targetted at the specified cell by the immunological reaction.
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... toxicity for human fibroblasts. Immunotoxins are another class of smart drugs, in this case activating only in the presence of cancer cells. An immunotoxin molecule is an engineered hybrid of functional protein modules fabricated from two different types of proteins: a toxin and an antibody. ...
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