Chain A ( L196 C197 R198 T199 F200 H201 T202 I203 G204 F205 C206 I215 H216 N217 A218 E220 R221 H381 N382 F383 A384 A385 V386 A387 A388 A389 A390 Y391 Y392 R393 S394 Q395 Q396 Q397 )