Table 3.

Transfer frequencies of the pIJ303 derivatives.

Plasmid	Transfer frequency (transconjugant/recipient) (%)*
	1	2	3	4	Mean ± SD
pIJ303	93.83	103.18	101.03	95.90	95.83 ± 1.57
pIJ303ΔspdA2	97.49	96.48	95.77	92.92	100.20 ± 4.04
pIJ303-sps	95.43	96.95	92.74	98.16	96.35 ± 3.44
pIJ303spdA2c	96.55	104.19	95.87	106.21	98.30 ± 5.69

^*Values of four biological replicates, no statistically significant difference; SD, standard deviation.