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Marker genes are essential for gene modification and genome editing of microorganisms. In Aspergillus oryzae, a widely used host for enzyme production, only a few marker genes can be used for positive selection. One of these genes, the pyrithiamine (PT) resistance marker gene thiA, is not useful for CRISPR/Cas9 genome editing because of its unique resistance-conferring mechanism. In this study, a novel PT resistance marker was investigated considering its potential applications in genome editing. A mutant resistant to PT was selected fr
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