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Immunoglobulin expression in autoimmune hepatitis and primary biliary cirrhosis. IgG-positive plasma cells (A) outnumber IgM-positive plasma cells (B) in most cases of autoimmune hepatitis (AIH); In contrast, IgM-positive plasma (C) cells predominate over IgG-positive cells (D) in the majority of cases of primary biliary cirrhosis (PBC). IgG background staining within sinusoids and blood vessels is common due to the presence of serum IgG. (Immunohistochemistry, 400 × magnification).
