name: IgM B cell receptor complex
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def: "An IgM immunoglobulin complex that is present in the plasma membrane of B cells and is composed of two identical immunoglobulin heavy chains of the IgM isotype and two identical immunoglobulin light chains and a signaling subunit, a heterodimer of the Ig-alpha and Ig-beta proteins." [GOC:add, ISBN:0781765196, PMID:20176268]
comment: Note that an IgM immunoglobulin complex has the function of antigen binding if a suitable antigen is available.
synonym: "membrane-bound IgM" NARROW [GOC:add]
synonym: "surface IgM" NARROW [GOC:add]
is_a: GO:0019815 ! B cell receptor complex
is_a: GO:0071753 ! IgM immunoglobulin complex
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