Chain A ( N37 S38 S39 Y40 V41 H42 P51 A52 D53 A54 V55 Y56 E60 K64 T111 F112 V113 H127 N128 D129 I130 R132 ),  Chain D ( P6 S7 P8 L9 L10 V11 G12 H79 V80 D81 A82 H83 A84 T85 G89 V90 V91 V92 Q93 )