Chain A ( S19 T21 L22 R27 A28 F29 V30 R31 W32 L33 P34 ),  Chain C ( P151 A152 C153 P154 S156 I158 T159 I160 N162 Q163 D321 R323 ),  Chain B ( G23 A24 N26 R27 A28 F29 V30 R31 W32 L33 P34 A35 Y37 G40 F41 S42 P103 ),  Chain D ( P124 R148 S149 P151 A152 C153 P154 G155 S156 N157 I158 T159 I160 R161 N162 Q163 I164 N165 D321 P322 R323 I324 A325 N326 V327 F328 D427 H428 G429 L430 W436 Q502 )