TABLE 6.

Effect of extra copies of phzI alone or phzR and phzI in trans on phzB expression by CM

CM source	β-Galactosidase activity
	30-84Z (pLAFR3)a	30-84Z (pLAF-2.7RVΔ3)b	30-84Z (pLSP10-21)
30-84I1/I2	161 ± 11	328 ± 30	1,055 ± 147
PU-15	13 ± 3	17 ± 4	478 ± 66
PU-43	44 ± 1	ND	1,299 ± 188
PU-295	25 ± 6	ND	360 ± 35

^aStrain 30-84Z(pLAFR3) contains the vector alone, strain 30-84Z(pLAF-2.7RVΔ 3) contains phzI, and strain 30-84Z(pLSP10-21) contains phzR and phzI. Activity is given as average Miller units ± standard deviations of results for three replicates.

^bND, not determined.