IgM immunoglobulin complex, circulating

id: GO:0071754
name: IgM immunoglobulin complex, circulating
namespace: cellular_component
type: go
obsolete: False

Description: A polymer of five or six IgM core units each composed of two identical immunoglobulin heavy chains of the IgM isotype and two identical immunoglobulin light chains, held together by disulfide bonds; the individual IgM core units are held together via disulfide bonds with a single J chain polypeptide acting as a bridge between two of the polymeric units. Circulating IgM is present in the extracellular space, in mucosal areas or other tissues, or in the blood or lymph.

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