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Comparison of electrostatic surface potential in β-NRX1 and β-NRX2. Surface potentials calculated using the program GRASP (Petrey and Honig, 2003) are displayed in blue (positive) and red (negative) for the potential range +5 to −5 kT. The “top” surface is not shown for β-NRX2 because eight residues in the β9-β10 loop which contribute the top surface are disordered.
