HelixConstraint A50 E56 0.623 HelixConstraint T65 F76 0.7161 HelixConstraint L123 Q137 0.6176 HelixConstraint F144 N156 0.6867 HelixConstraint G166 A179 0.7119 HelixConstraint E192 A202 0.7607 HelixConstraint P209 N235 0.6315 StrandConstraint V245 V247 0.6356