Chain A ( N8 E26 H27 G28 G190 L191 D192 F193 E195 M196 V197 L198 L199 M201 A205 W206 L207 V208 H209 R210 Q211 W212 F213 L216 M260 H261 A263 L264 T265 G266 A267 T268 E269 I270 Q271 L277 L278 F279 T280 G281 H282 R411 M412 A413 I414 L415 G416 A419 W453 K456 L489 G490 M492 V493 Q494 A495 )