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Efficiency of transformation of M. loti with pPZP211: effect of the DNA concentration and the length of the growth period on competent-cell preparation. Symbols: circles, M. loti cells transformed with 0.3-μg/ml DNA; squares, M. loti cells transformed with 0.9-μg/ml DNA; triangles, M. loti cells transformed with 1.5-μg/ml DNA. Note the logarithmic scale on the y axis.
