Fig. 6From: High-level extracellular production of recombinant nattokinase in Bacillus subtilis WB800 by multiple tandem promotersAnalysis of fermentation of NK in the recombinant strain harboring pSG-PHpaII-PHpaII-PP43. The fermentation was carried out in a 5-L fermenter, and the cell growth and NK activity were measured by taking a sample every 2 hBack to article page