    New chain ID            Original chain ID

4v6v-pdb-bundle1.pdb:
           A                        AJ
           B                        AK
           C                        AL
           D                        AM
           E                        AN
           F                        AO
           G                        AP
           H                        AQ
           I                        AR
           J                        AS
           K                        AB
           L                        AT
           M                        AU
           N                        AC
           O                        AD
           P                        AE
           Q                        AF
           R                        AG
           S                        AH
           T                        AI
           U                        A1
           V                        AA
           W                        A2
           X                        A3
           Y                        BC
           Z                        BJ
           a                        BK
           b                        BN
           c                        BO
           d                        BP
           e                        BQ
           f                        BR
           g                        BS
           h                        BT
           i                        BD
           j                        BU
           k                        BV
           l                        BW
           m                        BX
           n                        BY
           o                        BZ
           p                        B0
           q                        B1
           r                        B2
           s                        BE
           t                        B3
           u                        B4
           v                        B5
           w                        B6
           x                        B7
           y                        B8
           z                        B9
           0                        BF
           1                        BG
           2                        BH
           3                        BL

4v6v-pdb-bundle2.pdb:
           A                        BA
           B                        Ba
