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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 (https://creativecommons.org/licenses/by/4.0/).
Scanning electron microscopy of the surface of a 48-h biofilm of B. subtilis 168, B. subtilis BRB14, B. subtilis spo0A−, B. subtilis degU−, B. subtilis abrB−; ×1000 k, mark 1 µm.