    New chain ID            Original chain ID

9fg5-pdb-bundle1.pdb:
           A                         A
           B                         B
           C                         C
           D                         D
           E                         E
           a                         a
           b                         b
           F                         F
           c                         c
           G                         G
           d                         d
           e                         e
           H                         H
