Biopsied canine liver tissues were investigated histochemically by ele
ctron microscopy to demonstrate copper localization. The samples were
fixed and stained with the modified sulfide-silver method with a combi
nation of iron and zinc removal. Using this method, the hepatic copper
, even at a low concentration of 30 mu g/g dry weight, was detectable.
Copper was found in the hepatocyte lysosomes or in the cytoplasm as e
lectron-dense granules.