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Yarrowia lipolytica is a dimorphic fungus that secretes either an acidic or an alkaline protease depending on the environmental pH. Previous results have indicated that secretion of the alkaline protease is under control of the pH signaling Pal/Rim pathway originally described in Aspergillus nidulans. Several Y. lipolytica mutants defective in some Rim components of this pathway have been previously...