Chain A ( F22 I26 A27 L29 M30 E47 L48 I49 S50 N51 S52 D54 A55 K58 I96 G97 M98 A101 D102 L103 I104 N105 N106 L107 G108 T109 I110 A111 K112 S113 G114 T115 K116 A117 G132 F134 G135 V136 G137 F138 Y139 S140 A141 V150 T152 K153 T184 V186 )