Table 1. Comparison of extracellular protease activity between the Bacillus amyloliquefaciens NK-ΔLP and Bacillus amyloliquefaciens NK-Q-X strains in levan fermentation medium.

Strains	Extracellular protease activity (%)
NK-ΔLP	100 ± 12.3
NK-Q-1	104 ± 1.7
NK-Q-2	62.1 ± 3.3
NK-Q-3	50.5 ± 1.4
NK-Q-4	55.6 ± 17.4
NK-Q-5	54.6 ± 2.0
NK-Q-6	44.2 ± 0.7
NK-Q-7	14.3 ± 1.2*

All cultures were repeated at least five times.

Asterisks indicate significant difference from the NK-ΔLP strain (P < 0.05).