    New chain ID            Original chain ID

6tf9-pdb-bundle1.pdb:
           A                       AP1
           B                       CP1
           C                       DP1
           D                       EP1
           E                       FP1
           F                       GP1
           G                       HP1
           H                       IP1
           I                       JP1
           J                       KP1
           K                       LP1
           L                       MP1
           M                       NP1
           N                       OP1
           O                       PP1
           P                       QP1
           Q                       RP1
           R                       SP1
           S                       TP1
           T                       UP1
           U                       VP1
           V                       WP1
           W                       XP1
           X                       YP1
           Y                       ZP1
           Z                       aP1
           a                       bP1
           b                       cP1
           c                       dP1
           d                       eP1
           e                       fP1
           f                       gP1
           g                       hP1
           h                       iP1
           i                       jP1
           j                       kP1
           k                       lP1
           l                       mP1
           m                       nP1
           n                       oP1

6tf9-pdb-bundle2.pdb:
           A                       pP1
           B                       qP1
           C                       rP1
           D                       sP1
           E                       tP1
           F                       uP1
           G                       vP1
           H                       wP1
