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Direct selection of Geneticin® resistance in yeast does not work well because newly
transformed cells need time to express sufficient amounts of the resistance factor. Since yeast grow much more slowly than bacteria, significant numbers of recombinant yeast are killed before they accumulate enough of the resistance factor to survive direct plating on antibiotic. Do not use Geneticin® resistance as a selectable marker. The procedure to generate Geneticin® resistant clones requires an initial selection of His+ transformants followed by a screen for varying levels of Geneticin® resistance. Resistance to Geneticin® conferred by the kanamycin gene present on pPIC9K is used as a SCREEN, not as a SELECTION for multicopy integrants.