What's the story behind the research on "Bacillus subtilis fibrinolytic enzyme" in Zhen Fu, Hubei Province?

Inspired by the thrombolytic effect of Japanese nattokinase, Professor Wang, the founder of Hubei Province, collected hundreds of fermented bean products, including natto, fermented bean curd and fermented soybean. And screened thousands of microorganisms. Finally, the core patent strain Bacillus subtilis was screened out. The strain can produce fibrinolytic enzyme and dissolve thrombus through fermentation. Thus open that door to industrialization.