Immunoglobulins are also known as antibodies. They are Y-shaped proteins which are build up from four subunits and which bind to an antigen. Upon antigen binding they recruit the immune system for additional help (recognition of an antigen, endocytosis by macrophages etc.).

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IgA complement activation

Recently, I have been reading Janeway's immunobiology and had a question on immunoglobin A. I read that IgA activates the complement pathway using the Fab fragment of the IgA. How does IgA do that? I ...
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Can cancer be an immune system disorder? [closed]

Can cancer result from a weakened immune system? Would this mean that cancer could be considered an immune system disorder?
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What cell types produce immunoglobins and where are those cells found?

I know B cells found in bone marrow produce immunoglobin G. But IgM is produced in mucosal cells at least in the gut. Can you find immunoglobin expressing cells in other tissues in the human body? ...