Chain A ( K802 M804 A805 S806 K807 K808 P810 L811 W812 L813 E814 G829 I830 I831 F832 K833 G835 D836 D837 L838 Q840 D841 I844 L845 Y867 K875 I879 E880 I881 V882 K883 D884 A885 T886 T887 K890 R947 H948 N949 D950 N951 M953 F961 I963 D964 F965 G966 H967 I968 )