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immunoglobulin
This term carries a clinical and biochemical weight, specifically referring to the molecular structure of antibodies. It is used primarily in medical laboratories, immunology textbooks, and diagnostic reports rather than in casual conversation, where the word antibody is more common. Within a medical context, the word often signals a focus on the specific class or isotype of the protein, such as IgA or IgM, to determine the stage of an infection or the presence of an autoimmune disorder.
Countable when referring to the different types or isotypes of the proteins, such as the five classes of immunoglobulins. Uncountable when referring to the total mass or concentration of these proteins in a biological sample.