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Auxotrophic mutants of Aspergillus can be isolated in the presence of counter-selective compounds, but the process is laborious. We developed a method to enable reversible impairment of the ku80 gene (Aaku80) in the imperfect fungus Aspergillus aculeatus. Aaku80 was replaced with a selection marker, orotidine 5’-phosphate decarboxylase (pyrG), followed by excision of pyrG between direct repeats (DR)...
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