    New chain ID            Original chain ID

9rce-pdb-bundle1.pdb:
           H                         H
           I                         I
           B                         B
           C                         C
           D                         D
           E                         E
           M                         M
           F                         F
           N                         N
           J                         J
           K                         K
           L                         L
           c                         c
           A                         A

9rce-pdb-bundle2.pdb:
           G                         G
