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Plasmid transfer is activated in human plasma. OG1SSp(pCF10) cells were grown for 2 h in THB and human plasma, respectively. Cells were then brought together for a 10-min mating with the recipient OG1RF. Matings were performed in triplicate; a representative experiment of several independent experiments is shown. Rabbit plasma showed a similar result (not shown). Significance was determined by Student's t test (P < 0.01).
