    New chain ID            Original chain ID

9d48-pdb-bundle1.pdb:
           A                         A
           B                         B
           E                         E
           F                         F
           G                         G
           I                         I
           M                         M

9d48-pdb-bundle2.pdb:
           N                         N
           Q                         Q
           R                         R
           W                         W
           X                         X
