    New chain ID            Original chain ID

9ss1-pdb-bundle1.pdb:
           A                        AA
           B                        AC
           C                        AD
           D                        AE
           E                        AF
           F                        AG
           G                        AH
           H                        AJ
           I                        AK
           J                        AL
           K                        AN
           L                        AO
           M                        AP
           N                        AQ
           O                        AR
           P                        AS
           Q                        AT
           R                        D1
           S                        F1
           T                        F3
