SUMMARY: The fission yeast was grown in the presence of 10 to 10 M-sodium tellurite. Growth was inhibited by tellurite and at concentrations above 10 M a black reduction product (probably tellurium) was visible in sedimented cells. Electron microscopy of thin sections showed the reduction product to be on a localized system of membranous vesicles forming an area about 500 nm in diameter. Membrane systems of this type were not seen in control cells but they possibly resulted from the degeneration of some of the mitochondria.


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