Table 1.

Sporulation capacities of the pkaR mutants^a

Strain	No. of spores/cm2, mean ± SEM
wt	(1.2 ± 0.2) · 107
ΔR2	(1.0 ± 0.1) · 107
ΔR3	(8.1 ± 0.2) · 106
ΔR4	(3.0 ± 0.1) · 105

^aSpores (n = 100) of each strain were spread onto minimal medium plates in triplicate and incubated at 30°C for 5 days. Plugs of agar (1 cm²) were removed for spore counting.