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Multicopy plasmid RSF1010 and four of its in vitro-constructed derivatives were mobilized by the self-transmissible RP4 plasmid into Azotobacter vinelandii UW. Modifications of the Escherichia coli transformation procedure of Cohen et al. (Proc. Natl. Acad. Sci. U.S.A. 69:2110-2114, 1972) allowed transformation of A. vinelandii strains UW and ATCC 12837 with purified RP4 or RSF1010 deoxyribonucleic acid.
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David et al. (1981) studied this question.
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