    New chain ID            Original chain ID

8d9w-pdb-bundle1.pdb:
           N                         N
           Y                         Y
           B                         B
           M                         M
           F                         F
           A                         A
           K                         K
           U                         U
           X                         X
           e                         e
           I                         I
           D                         D
           O                         O
           V                         V
           Z                         Z
           f                         f
           d                         d
           j                         j
           E                         E
           a                         a
