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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/).
Tall fescue seedling root hair stained with 0.1% nitro blue tetrazolium showing superoxide (purple color) around bacterial protoplasts in the hair (arrow; bar = 20 µm).