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Pichia guilliermondii is a representative of a yeast species, all of which over-synthesize riboflavin in response to iron deprivation. Molecular genetic studies in this yeast species have been hampered by a lack of strain-specific tools for gene manipulation. Stable P. guilliermondii ura3 mutants were selected on the basis of 5′-fluoroorotic acid resistance. Plasmid carrying Saccharomyces cerevisiae...
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