    New chain ID            Original chain ID

6tbv-pdb-bundle1.pdb:
           A                      16S1
           B                      S021
           C                      S031
           D                      S041
           E                      S051
           F                      S061
           G                      S071
           H                      S081
           I                      S091
           J                      S101
           K                      S111
           L                      S121
           M                      S131
           N                      S141
           O                      S151
           P                      S161
           Q                      S171
           R                      S181
           S                      S191
           T                      S201
           U                      S211

6tbv-pdb-bundle2.pdb:
           A                      23S1
           B                      05S1
           C                      L021
           D                      L031
           E                      L041
           F                      L051
           G                      L061
           H                      L091
           I                      L311
           J                      L131
           K                      L141
           L                      L151
           M                      L161
           N                      L171
           O                      L181
           P                      L191
           Q                      L201
           R                      L211
           S                      L221
           T                      L231
           U                      L241
           V                      L251
           W                      L271
           X                      L281
           Y                      L291
           Z                      L301
           a                      L321
           b                      L331
           c                      L341
           d                      L351
           e                      L361
           f                      SPE1
           g                      MRN1
           h                      PTR1
