    New chain ID            Original chain ID

9zni-pdb-bundle1.pdb:
           A                         1
           B                         2
           C                         3
           D                         6
           E                         7
           F                        AA

9zni-pdb-bundle2.pdb:
           A                        AB
           B                        AC
           C                        AD
           D                        AE
           E                        AF
           F                        AG
           G                        AH
           H                        AI
           I                        AJ
           J                        AK
           K                        AL
           L                        AM
           M                        AN
           N                        AO
           O                        AP
           P                        AQ
           Q                        AR
           R                        AS
           S                        AT
           T                        AU
           U                        AV
           V                        AW
           W                        AX
           X                        AY
           Y                        AZ
           Z                        Aa
           a                        Ab
           b                        Ac
           c                        Ad
           d                        BA
           e                        BB
           f                        BC
           g                        BD
           h                        BE
           i                        BF
           j                        BG
           k                        BH
           l                        BI
           m                        BJ
           n                        BK
           o                        BL
           p                        BM
           q                        BN
           r                        BO
           s                        BP
           t                        BQ
           u                        BR
           v                        BS
           w                        BT
           x                        BU
           y                        BV
           z                        BW
           0                        BX
           1                        BY
           2                        BZ
