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Growth of wild-type strain CAF4-2 (ura3/ura3 ODC/ODC) (a and d), ABH2 (ura3/ura3 ODC/Δodc::hisG) (b), ABH4 (ura3/ura3 Δodc::hisG/Δodc::hisG) (c), and ABH4 transformed with plasmid pAHH7 (e) or pAHH8 (f) in the absence of polyamines. Plates contained solid Lee medium (see Materials and Methods).
