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Updated: May 1, 2026

Characterization of Thymus-dependent and Thymus-independent Immunoglobulin Isotype Responses in Mice Using Enzyme-linked Immunosorbent Assay
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[Primary selective IgM deficiency--forgotten primary immunodeficiency?].

Danuta Kowalczyk, Anna Szaflarska

    Przeglad Lekarski
    |April 12, 2014
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    Summary
    This summary is machine-generated.

    Immunoglobulin M (IgM) is the first antibody made during an immune response and is crucial for newborns. Lower IgM levels can indicate autoimmune diseases or primary immunodeficiencies.

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    Area of Science:

    • Immunology
    • Biochemistry

    Context:

    • Immunoglobulin M (IgM) is a crucial antibody isotype.
    • It exists as a pentamer in the intravascular compartment and on B lymphocytes.
    • IgM is the initial antibody produced during immune responses and by fetuses/newborns.

    Purpose:

    • To define the role and characteristics of Immunoglobulin M (IgM).
    • To highlight its significance in early immune responses and fetal development.

    Summary:

    • Immunoglobulin M (IgM) is a pentameric antibody found intravascularly and on B cells.
    • It represents the primary antibody isotype in initial immune responses and neonatal immunity.
    • Unlike other antibodies, IgM does not cross the placenta.

    Impact:

    • Understanding IgM levels is vital for diagnosing autoimmune diseases.
    • Decreased IgM is linked to various primary immunodeficiencies.
    • Monitoring IgM provides insights into immune system function in newborns and adults.