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. 2020 Nov 19;12(11):724. doi: 10.3390/toxins12110724

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© 2020 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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Effect of different urea concentrations on the (A) OD₆₈₀, (B) relative growth rate, and (C) total intracellular anatoxin concentration of C. issatschenkoi. The N concentration in groups A–D corresponded to 1%, 4%, 7%, and 10% of the N concentration in BG11, which was 0.176, 0.704, 1.232 and 1.76 mM, respectively.