    New chain ID            Original chain ID

9gi1-pdb-bundle1.pdb:
           A                        Pa
           B                        Pb
           C                        Pc
           D                        Pd
           E                        Pe
           F                        Pf
           G                        Pg
           H                        Ph
           I                        Pi
           J                        Pl
           K                        Pm
           L                        Pn
           M                        Po
           N                        Pq
           O                         S
           P                         a
           Q                         b
           R                         c
           S                         d
           T                         e
           U                         f
