    New chain ID            Original chain ID

7abf-pdb-bundle1.pdb:
           A                         Q
           B                         I
           C                         A
           D                         r
           E                         N
           F                         q
           G                         R
           H                         5
           I                         6
           J                         X
           K                         v
           L                         G
           M                         Z
           N                         K
           O                        A4
