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Transformation of S. pneumoniae R6, CP1250, and TIGR4 wild-type and ΔradA mutant strains with chromosomal DNA from the D39 Δcps and TIGR4 Δcps strains. Transformation efficiencies are given as percentages relative to those of the wild-type (w.t.) strains. Data were derived from three independent experiments and are presented as means ± standard deviations.
