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A new binary vector encoding for Candida albicans dihydrofolate reductase (DFR1) has been constructed and used as a dominant selectable marker for plant transformation. Transgenic tobacco plants with an increased resistance to methotrexate (Mtx) were obtained by co-transformation of tobacco leaf discs with Agrobacterium tumefaciens strains carrying two new binary vectors: pTI20 and pTI18. Co-transformants...
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