Immunoglobulin M

Immunoglobulin M (IgM) is the largest of several isotypes of antibodies (also known as immunoglobulin) that are produced by vertebrates. IgM is the first antibody to appear in the response to initial exposure to an antigen; causing it to also be called an acute phase antibody. In humans and other mammals that have been studied, plasmablasts in the spleen are the main source of specific IgM production.

"IgM" redirects here. For articles with topics often written as "IGM", see IGM.
Immunoglobulin M
(pentamer)
Protein typeantibody
Subunit nameGeneChromosomal locus
Immunoglobulin heavy chain ยตIGH@
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