Dear collegues,

I want to produce double mutants by disrupting genes in Sachharomyces. Previously I have done gene disruption using the KanMx cassette. I was thinking to produce the second mutation utilizing a auxotrophic marker like URA3 or HIS3 or LEU2 for easier selection. But I am having difficulty in finding a plasmid source from where I can procure such cassette in order to perform the deletion/disruption. Please suggest.

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