HelixConstraint A20 S27 0.636 HelixConstraint M48 F50 0.648 HelixConstraint L59 K62 0.662 HelixConstraint A69 R78 0.644 HelixConstraint K84 Y90 0.634 HelixConstraint A107 T114 0.69 HelixConstraint M124 M130 0.641