Chain A ( A163 M164 Y165 V166 Y167 P168 P169 N170 V171 E172 S173 S174 P175 E176 P178 H180 I181 I251 L252 K253 V254 C255 G256 C257 D258 E259 Y260 F261 L262 E263 K264 Y265 L267 S268 Q269 Y270 K271 Y272 I273 R274 S275 C276 I277 M278 L279 G280 R281 M282 N284 L285 M286 L287 M288 L293 Q296 L623 T624 D625 D626 K627 L628 S629 Q630 Y631 L632 Q634 L635 F652 L653 L654 K655 K656 A657 L658 T659 N660 Q661 R662 I663 G664 H665 F666 C695 Y698 H701 G750 F751 L752 S753 P754 L755 N756 P757 A758 H759 Q760 L761 D787 L792 L793 F794 N797 E798 I799 M811 L812 T813 L814 Q815 I816 I817 R818 I819 M820 E821 N822 I823 Q825 N826 L834 P835 Y836 G837 C838 I848 E849 V850 V851 R852 K924 L997 F998 L1001 )