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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/).
B. thuringiensis sporangium containing the spore and parasporal inclusion with toxins crystal. The spore and paraspore are protected by the presence of the exosporium during interaction with the host midgut environment.