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Immunocytochemical detection of TGF-β1 in liver tissue. (A) Uninfected WT BALB/c mice show prominent reaction product at most hepatocytes (arrows). (B) At 14 days after L. donovani infection, TGF-β1 expression is near absent at hepatocytes and developing granulomas; arrows indicate few positive-staining cells. Peroxidase with Carazzi hematoxylin counterstain. Magnification, ×180 (original magnification, ×200).
