Abstract
Samples of liver from untreated rats, from rats infused with unconjugated bilirubin, and from biopsies of human liver were fixed overnight in cold formol-calcium. Frozen sections were stained for acid phosphatase activity by the Gomori lead-glycerophosphate procedure. Small blocks of fixed tissue were also incubated in this medium. These were then treated briefly with osmium tetroxide, dehydrated, and embedded in methacrylate. Thin sections were studied by electron microscopy. The sites of reaction product of acid phosphatase activity as visualized in electron micrographs are consistent with those seen in frozen sections studied by light microscopy. They indicate that the pericanalicular bodies of parenchymatous cells, the large spherical bodies of Kupffer cells, the microbodies appearing after bilirubin infusion and lipofuscin granules belong to the class of cytoplasmic organelles called lysosomes by de Duve.
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Selected References
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