    New chain ID            Original chain ID

7k58-pdb-bundle1.pdb:
           A                         A
           C                         C
           Q                         Q

7k58-pdb-bundle2.pdb:
           B                         B
           I                         I
           H                         H
           G                         G
           F                         F
           N                         N
           O                         O
           E                         E
           D                         D
           P                         P
           L                         L
           K                         K
           J                         J
           M                         M
