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. 2015 Mar 3;119(13):4601–4607. doi: 10.1021/acs.jpcb.5b00289

Figure 3.

Figure 3

2D PMFs of rotation angle vs tilt angle for TM helices containing E and D side chains for low and high pH values where the titratable side chains are predominantly protonated (neutral) and unprotonated (negatively charged) respectively. The color bars are in kcal/mol.