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. 2016 Sep 20;16:217. doi: 10.1186/s12866-016-0830-4

Fig. 4.

Fig. 4

a Effect of independent variables on cholesterol oxidase production by Streptomyces cavourensis strain NEAE-42 using Plackett-Burman design (The red color represent the most significant positive independent variables affecting enzyme production); b Pareto chart illustrates the order and significance of the variables affecting cholesterol oxidase production by Streptomyces cavourensis strain NEAE-42 using Plackett-Burman design (the blue colors represent negative effects and the orange color represent positive effects)