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Helix αB′ is tethered to helices αB and αC via hydrophobic and hydrogen-bonding interactions. The side chains of the hydrophobic residues are shown as sticks with dotted spheres showing the van der Waals radius for each atom. The hydrogen bond between N∊1 of Trp428 and O∊1 of Glu416 is shown as a purple dashed line.
