Chain A ( K24 N25 R94 Y97 Y98 C118 L120 G121 P122 R123 P124 D126 M163 V164 S165 V166 G167 A168 I170 E191 E193 R235 I236 L299 V300 Y301 A305 T306 D307 L308 D327 T328 I329 Y330 P331 E332 R333 L371 R372 R398 )