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The role of multi-drug resistance (MDR1) and its product, P-glycoprotein (P-gp) on 5-aminolevulinic acid hexyl ester (Hexyl-ALA) mediated phototoxicity was determined with human uterine sarcoma cells, MES-SA control and MDR1 expressing MES-SA-Dx5. MDR1 expression reduced intracellular levels of the Hexyl-ALA metabolite, protoporphyrin IX (PpIX) to a limited(More)
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