TABLE 3.

Efficiency of sporulation of B. subtilis strains carrying mutations in the phrE gene^a

Strain	Relevant genotype	Viable cell count ml−1	Spore count ml−1	Percentageb
JH642	Wild type	3.4 × 108	1.1 × 108	32.3
JH11969	ΔphrE	6.9 × 108	1.2 × 108	17.4
JH11970	ΔphrE amyE::phrE wild type	4.0 × 108	1.3 × 108	32.5
JH11971	ΔphrE amyE::phrE mutant 1	6.5 × 108	1.0 × 108	15.4
JH23037	ΔphrE amyE::phrE mutant 2	4.5 × 108	1.9 × 108	42.2

^aData are representative of results from two independent experiments.

^bThe percentage is calculated as the ratio between spore count and viable cell count.