Chain A ( L198 K199 R200 I201 Q202 I203 W204 K205 R206 Q207 Q208 Q209 L221 L224 T267 V269 T270 S271 C272 F273 L274 V275 Q278 R294 F295 A321 E323 V386 F388 Q404 A405 L406 S407 L408 P409 D429 N430 S433 E434 M435 D436 R437 V438 P439 F440 )