    New chain ID            Original chain ID

4v5v-pdb-bundle1.pdb:
           A                        AA
           B                        AB
           C                        AC
           D                        AD
           E                        AE
           F                        AF
           G                        AG
           H                        AH
           I                        AI
           J                        AJ
           K                        AK
           L                        AL
           M                        AM
           N                        AN
           O                        AO
           P                        AP
           Q                        AQ
           R                        AR
           S                        AS
           T                        AT
           U                        AU
           V                        AV
           W                        BA
           X                        BB
           Y                        BC
           Z                        BD
           a                        BE
           b                        BF
           c                        BG
           d                        BH
           e                        BI
           f                        BJ
           g                        BK
           h                        BL
           i                        BM

4v5v-pdb-bundle2.pdb:
           A                        BN
           B                        BO
           C                        BP
           D                        BQ
           E                        BR
           F                        BW
           G                        BX
           H                        BY
           I                        BZ
