1. One of the five major classes of immunoglobulins; involved in fighting blood infections and in triggering production of immunoglobulin G
   - immunoglobulin M

Type of: Ig, immune gamma globulin, immune globulin, immune serum globulin, immunoglobulin

Encyclopedia: IgM

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• constituency
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• Constitution of the United States
• Constitution State
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• Constitutional Convention
• Constitutional Union Party
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