    New chain ID            Original chain ID

9wt1-pdb-bundle1.pdb:
           A                         A
           B                        1A
           C                        2A
           D                        1a
           E                        2a
           F                         B
           G                        1B
           H                        2B
           I                        1b
           J                        2b
           K                         C
           L                        1C
           M                        2C
           N                        1c
           O                        2c
           P                         D
           Q                        1D
           R                        2D
           S                        1d
           T                        2d
           U                         E
           V                        1E
           W                        2E
           X                        1e
           Y                        2e
           Z                         F
           a                        1F
           b                        2F
           c                        1f
           d                        2f
