| isotype | 1. <immunology> Applied to a set of macromolecules sharing some features in common. In immunology isotype describes the class, subclass, light chain type and subtype of an immunoglobulin. 2. Antigenic determinant that is uniquely present in individuals of a single species. 3. <statistics> A conventionalised method for the graphical display of statistical data. (18 Nov 1997) |
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| isotype switching | <immunology> The switch of immunoglobulin isotype that occurs, for example: as the immune response progresses (IgM to IgG). The switch from IgM to IgG involves only the constant region of the heavy chains (from _ to _), the light chain and variable regions of the heavy chain remaining the same and involves the switch regions, upstream (on the 5'side) of the constant region genes, at which recombination occurs. Similarly, IgM and IgD with the same variable region of the heavy chain, but with different heavy chain constant regions (_ and _), seem to coexist on the surface of some lymphocytes. (18 Nov 1997) |