    New chain ID            Original chain ID

6kco-pdb-bundle1.pdb:
           A                         A
           B                         B
           C                         C
           D                         D
           E                         E
           F                         F
           G                         G
           H                         H
           I                         I
           J                         J
           K                         K
           L                         L
           M                         M
           N                         N
           O                         O
           P                         P
           Q                        1O
           R                        2M
           S                        1P
           T                        1H
           U                        4D
           V                        7E
           W                        6F
           X                        2G
           Y                        5I
           Z                        4J
           a                        3L
           b                        9N
           c                        6A
           d                        3B
           e                        7C
           f                        8K
