Chain A ( G8 S9 A10 K12 D32 T33 A34 W52 P54 S55 N56 Y57 S58 R59 K60 F61 L62 H73 S74 L75 N76 L77 I80 L107 S108 V110 L111 G112 K196 T197 G198 T199 S200 N201 N202 Y203 )