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Fig. 9. Immunohistochemical localisation of vitellogenin (Vtg) in the liver and hindgut of eelpout embryos exposed to 4-tert-octylphenol (4-tOP) in ovario for 35 days. (A) Control liver: no Vtg-staining. (B) 100 µgl-1 4-tOP (OP100)-treated liver: strong Vtg-specific staining in cytoplasm of hepatocytes (arrow) and blood capillaries (b). (C) Control hindgut: no Vtg-staining. (D) OP100-treated hindgut: Vtg-staining in cellular debris (cd) in the lumen (L) and the periphery of epithelial cells of the hindgut (arrow). Scale bars, A and B=20 µm; C and D=200 µm.