pho mutation effects on speed and efficiency of Lac+-colony formation do not account for MBR-deficiency.

aValues are means ± one standard deviation (SD). In each case, four-six independent day-5 or day-6 Lac+ mutants were used as controls for the time of colony formation (see Materials and Methods), with the exception of SMR4562 for which day-2 mutants were used (they behave similarly [41]). Exp. 1 was carried out to day 5, and Exp. 2 to day 6.b Only two Lac+ control strains were used in this case and so a range, rather than SD is given.c We note that the time to Lac+ colony formation for different isolates of ΔpstS ΔphoBR strain SMR6760 varies from two to five days. They all form normal-size colonies and are not detectably amplified (amplified Lac+ take 3–5 days to form, [27]).pho mutation effects on speed and efficiency of Lac+-colony formation do not account for MBR-deficiency.