[Term] id: GO:0071746 name: IgA immunoglobulin complex, circulating namespace: cellular_component def: "A protein complex composed of two identical immunoglobulin heavy chains of an IgA isotype and two identical immunoglobulin light chains, held together by disulfide bonds, sometimes complexed with J chain or J chain and secretory component, and present in the extracellular space, in mucosal areas or other tissues, or circulating in the blood or lymph." [GOC:add, ISBN:0781765196, PMID:16362985] comment: Note that an IgA immunoglobulin complex has the function of antigen binding if a suitable antigen is available. synonym: "IgA antibody" EXACT [GOC:add] is_a: GO:0032991 ! protein-containing complex