Chain A ( L62 N63 L64 P65 I88 T89 G90 L91 L92 E93 F94 E95 V96 Y97 L98 E99 Y100 Q116 M117 T119 K120 I136 T137 T138 P139 D140 P141 T142 T143 N144 A145 S146 L147 L148 L151 )