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(A) Immunohistochemical staining for IgA positive plasma cells in parotid gland biopsy specimen before treatment, showing a few IgA positive plasma cells (arrow) and a massive infiltrate with a few ducts (magnification x200). (B) Immunohistochemical staining for IgA positive plasma cells in parotid gland biopsy specimen after rituximab treatment, showing less infiltrate and more salivary gland ducts, with a relative increase of IgA positive plasma cells (arrows) (magnification x200).
