    New chain ID            Original chain ID

4v7g-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                        AW
           X                        AX
           Y                        AY
           Z                        AZ
           a                        A1
           b                        A2
           c                        A3
           d                        A4
           e                        BA
           f                        BB
           g                        BC
           h                        BD
           i                        BE
           j                        BF
           k                        BG
           l                        BH
           m                        BI
           n                        BJ
           o                        BK
           p                        BL
           q                        BM
           r                        BN
           s                        BO
           t                        BP
           u                        BQ
           v                        BR
           w                        BS
           x                        BT
           y                        BU
           z                        BV
           0                        BW
           1                        BX
           2                        BY
           3                        BZ
           4                        B1
           5                        B2
           6                        B3
           7                        B4
           8                        CA
           9                        CB

4v7g-pdb-bundle2.pdb:
           A                        CC
           B                        CD
           C                        CE
           D                        CF
           E                        CG
           F                        CH
           G                        CI
           H                        CJ
           I                        CK
           J                        CL
           K                        CM
           L                        CN
           M                        CO
           N                        CP
           O                        CQ
           P                        CR
           Q                        CS
           R                        CT
           S                        CU
           T                        CV
           U                        CW
           V                        CX
           W                        CY
           X                        CZ
           Y                        C1
           Z                        C2
           a                        C3
           b                        C4
