    New chain ID            Original chain ID

7scb-pdb-bundle1.pdb:
           A                        AA
           B                        AB
           C                        AC
           D                        AD
           E                        AE
           F                        AF
           G                        AH
           H                        AI
           I                        AJ
           J                        AK
           K                        AL
           L                        AN
           M                        AO
           N                        AP
           O                        AQ
           P                        AR
           Q                        AS
           R                        AU
           S                        AV
           T                        AW
           U                        AX
           V                        AY
           W                        AZ
           X                        BB
           Y                        BC
           Z                        BE
           a                        BG
           b                        BH
           c                        BI
