    New chain ID            Original chain ID

4v8r-pdb-bundle1.pdb:
           A                        AA
           B                        AB
           C                        AD
           D                        AE
           E                        AG
           F                        AH
           G                        AQ
           H                        AZ
           I                        Aa
           J                        Ab
           K                        Ad
           L                        Ae
           M                        Ag
           N                        Ah
           O                        Aq
           P                        Az
           Q                        BA
           R                        BB
           S                        BD
           T                        BE
           U                        BG
           V                        BH
           W                        BQ
           X                        BZ

4v8r-pdb-bundle2.pdb:
           A                        Ba
           B                        Bb
           C                        Bd
           D                        Be
           E                        Bg
           F                        Bh
           G                        Bq
           H                        Bz
