    New chain ID            Original chain ID

4v69-pdb-bundle1.pdb:
           A                        AJ
           B                        AK
           C                        AL
           D                        AM
           E                        AN
           F                        AO
           G                        AP
           H                        AQ
           I                        AR
           J                        AS
           K                        AT
           L                        AU
           M                        AB
           N                        AC
           O                        AD
           P                        AE
           Q                        AF
           R                        AG
           S                        AH
           T                        AI
           U                        AA
           V                        AY
           W                        AW
           X                        AX
           Y                        AZ
           Z                        AV
           a                        B5
           b                        BI
           c                        BJ
           d                        BK
           e                        BL
           f                        BM
           g                        BN
           h                        BO
           i                        BP
           j                        BQ
           k                        BR
           l                        BS
           m                        BT
           n                        BU
           o                        BV
           p                        BW
           q                        BX
           r                        BY
           s                        BC
           t                        BZ
           u                        B0
           v                        B1
           w                        B2
           x                        B3
           y                        B4
           z                        BD
           0                        BE
           1                        BF
           2                        BG
           3                        BH

4v69-pdb-bundle2.pdb:
           A                        BB
           B                        BA
