Abstract
In order to ascertain the main target of the photodynamic effect with the sensitizer thiopyronine (TP) and its interference with cellular DNA, the uptake of TP into the yeastSaccharomyces cerevisiae and the distribution of the dye within the cells were studied. After fractionation of the cellular components, about 1% of the TP was found to be bound to the nucleus in anaerobically grown yeast cells; in aerobically grown cells, about 7% could be detected at the mitochondria.
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