    New chain ID            Original chain ID

26ip_1-pdb-bundle1.pdb:
           A                         A
           B                         B
26ip_1-pdb-bundle2.pdb:
           A                         B
           B                         C
26ip_1-pdb-bundle3.pdb:
           A                         C
           B                         D
           C                         G
           D                         H
           E                         I
           F                         J
