isotype

/ˈaɪsəˌtaɪp/
noun
  1. A type of antibody or immunoglobulin class (such as IgG, IgA, IgM) that is defined by the structure of its constant region.
    • IgG is the most abundant isotype in human blood and plays a key role in long-term immunity.
    • The lab test measures the levels of each antibody isotype to check for immune system disorders.
    • Different isotypes of antibodies have different functions, such as IgA protecting mucous membranes.
  2. A symbol or diagram used to represent a specific type of thing, especially in statistical charts or educational materials.
    • The designer created simple isotypes for animals to make the chart easier for children to understand.
    • In the infographic, each isotype of a person stands for one million people.
    • The textbook used an isotype of a factory to represent industrial output in the 1900s.
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