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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Comparison of relative area of distribution of the surfactin variant groups produced by B. subtilis in the original culture medium with the altered carbon sources. Significance levels of the differences from the control are marked with asterisks: *** p < 0.001; ** p < 0.01; * p < 0.05.