Table 4. Spore titers of relevant strains.

Strain	Relevant genotype	Spore titer (cfu mL-1)a
CU1065	Parental strain	3.8 x 108
HB11002	ΔbshA	2.6 x 107
PY79	Parental strain	1.6 x 109
KP648	Δspo0A	≤102
BER657	ΔsigH	≤102
AD3303	ΔbshA	1.7 x 109
RP82	ΔbshC	1.3 x 109
RP238	ΔbstA-H	1.2 x 109
RP259	ΔbrxA, ΔbrxB, ΔytxJ	1.9 x 109

^aTiters were determined as described in the “Materials and Methods.” The values shown are averages of at least two experiments.