HelixConstraint S21 N27 0.624 HelixConstraint L36 R37 0.606 HelixConstraint C39 T51 0.762 StrandConstraint G61 A64 0.614 HelixConstraint W70 Y74 0.624 HelixConstraint L114 E126 0.829 HelixConstraint V182 H187 0.696 HelixConstraint K269 S273 0.715 HelixConstraint L306 D310 0.604