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DNA transformation competence of C9.10, C9.11 recA6, and MS11-B2. Strains were incubated in the absence or presence of IPTG as indicated for 5 h with plasmid pSY6, which confers resistance to NAL (NalR) when recombined into the chromosome. The transformation efficiency was expressed as the number of NAL-resistant transformants per CFU. A representative of three identical experiments is shown.
