Abstract

Spontaneous altered hepatocellular foci (AHF) of basophilic type were observed in adult male cotton rats. The histological features of these foci were similar to those observed in Fischer 344 rats. However, an immunohistochemical technique with antibody to glutathione S-transferase placental form (GST-P) failed to stain these foci. Also normal bile ducts were not immunoreactive for GST-P. The presence of a gall bladder and of non-GST-P immunoreactive liver foci and bile ducts suggests that these cotton rats are phylogenetically closer to mice than rats.

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