The specificity of the bond between antibody and antigen has made it an excellent tool in the detection of substances in a variety of diagnostic techniques, known collectively as diagnostic immunology. Antibodies specific for a desired antigen can be conjugated with a radiolabel, fluorescent label, or color-forming enzyme and are used as a "probe" to detect it. An antigen is a substance that stimulates an immune response, especially the production of antibodies. ...
Well known applications of this include immunoblotting, ELISA and immunohistochemical staining of microscope slides. The speed, accuracy and simplicity of such tests has led to the development of rapid techniques for the diagnosis of disease, microbes and even illegal drugs in vivo (of course tests conducted in a closed environment have a higher degree of accuracy). Such testing is also used to distinguish compatible blood types. Picture of a western blot with 5 vertical lanes A western blot (a. ... Elisa portrayed on the cover of her album Pearl Days. ... In vivo (Latin for (with)in the living). ... Blood type (or blood group) is determined, in part, by the ABO blood group antigens present on red blood cells. ...