Chain A ( E295 ),  Chain C ( D150 N151 S152 Y153 K154 M155 Y156 L273 T274 G275 K276 P277 K278 ),  Chain B ( R375 A378 T379 I386 ),  Chain D ( K320 I321 P322 A325 D326 F327 L394 T395 K396 L398 )