Chain A ( Q336 E339 K340 L341 D342 S343 Y344 K532 V533 F534 A535 P536 K537 Q538 K539 M540 F541 I547 V748 Y749 G750 F756 A793 Y795 K796 N797 L798 I799 M800 Q801 S802 K803 K804 K805 Y806 T807 T808 M809 K810 E822 R823 I824 N825 K826 G827 T828 S829 E830 T831 R832 R833 D834 V835 S836 K837 H839 K840 N841 M842 I843 K844 T845 Y846 K847 T848 R849 L850 S851 E852 M853 L854 V864 C865 I866 I868 M891 L892 K973 R974 L975 T976 S977 E978 I979 V980 N981 L982 L983 D984 N985 C989 F993 P1001 T1002 F1003 Y1004 )