Chain A ( L33 L35 F41 A55 A56 H57 C58 V59 A60 N61 V62 N62 R63 V65 V85 I88 E90 Y94 D102 ),  Chain B ( F41 A56 H57 C58 V59 A60 N61 V62 N62 R63 V65 I88 F89 E90 Y94 D95 P98 V104 I105 L106 )