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. 2019 Jan 18;9(1):114. doi: 10.3390/nano9010114

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© 2019 by the authors.

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/).

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Change of extracellular concentration of different substances with time: (a) Methylene blue, (b) Acid orange II, and (c) Pyrrole structure nano-pigment.