Chain A ( N8 E26 H27 G28 S29 C30 E44 L45 I46 K47 T48 E49 A50 K51 Y59 I61 N124 M125 E126 G127 K128 I129 V130 N134 L135 E136 Y137 L191 D192 F193 N194 E195 M196 V197 L198 L199 Q200 M201 E202 D203 K204 A205 W206 L207 V208 H209 R210 Q211 W212 F213 L214 L216 L218 Q256 E257 G258 A259 M260 H261 T262 A263 L264 T265 G266 A267 T268 E269 I270 Q271 M272 S273 S274 G275 N276 L277 L278 F279 T280 G281 H282 I414 W453 L489 M492 V493 Q494 A495 )