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. 2019 Jun 25;10:1428. doi: 10.3389/fmicb.2019.01428

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Copyright © 2019 Watzer, Spät, Neumann, Koch, Sobotka, Macek, Hennrich and Forchhammer.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Urea utilization and ammonium excretion of various Synechocystis strains as indicated. Exponentially growing and nitrate supplemented Synechocystis cells were washed and resuspended in a medium containing 150 μM urea. Shown are the means of three biological replicates. (A) Urea utilization and (B) ammonium excretion under constant illumination of 40 μmol photons m^-2 s^-1. (C) Urea utilization in presence of 2 mM ammonium and under constant illumination of 40 μmol photons m^-2 s^-1.