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. 2021 May 10;15:673782. doi: 10.3389/fncel.2021.673782

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Copyright © 2021 Szöllősi and Stockner.

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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Electrostatic gradients and fields. Electrostatic potential field lines solved by the adaptive Poisson-Boltzmann solver (APBS) of the outward-open SERT of (A) the apo state, (B) SERT with bound Cl⁻, (C) SERT with bound Cl⁻ and Na⁺ ions; the green dashed ellipse highlights the outer vestibule. Field lines are colored by potential with a color gradient form red through white till blue representing a scale from −1 to 1 (kT/e). Field strength more negative than −1 is red while values above 1 are blue.