HelixConstraint K16 T41 0.607 HelixConstraint D45 T71 0.674 StrandConstraint F77 M78 0.627 HelixConstraint R82 G108 0.63 HelixConstraint V119 A148 0.814 HelixConstraint V155 L186 0.61 HelixConstraint P192 A224 0.769