HelixConstraint P177 E185 0.873 StrandConstraint I199 F201 0.602 HelixConstraint F207 S212 0.686 StrandConstraint R221 M223 0.606 StrandConstraint M237 Y239 0.68 StrandConstraint P259 V262 0.667 StrandConstraint I271 Y273 0.725 StrandConstraint L288 A290 0.686