Chain A ( A21 L23 R24 C25 L26 C27 I28 K29 T30 I45 G46 H50 C51 N52 Q53 V54 E55 I57 K65 I66 C67 ),  Chain C ( C25 L26 C27 I28 K29 T30 T31 S32 G33 I34 Q40 L42 E43 V44 I45 E55 V56 I57 A58 T59 L60 K61 D62 G63 R64 K65 I66 C67 L68 D69 P70 A72 ),  Chain D ( L42 )