    New chain ID            Original chain ID

4v5o-pdb-bundle1.pdb:
           A                        A1
           B                        A2
           C                        A3
           D                        A4
           E                        A5
           F                        A6
           G                        A7
           H                        A8
           I                        A9
           J                        AA
           K                        AB
           L                        AC
           M                        AD
           N                        AE
           O                        AF
           P                        AG
           Q                        AH
           R                        AI
           S                        AJ
           T                        AK
           U                        AL
           V                        AM
           W                        AN
           X                        AO
           Y                        AP
           Z                        AQ
           a                        AR
           b                        AS
           c                        AT
           d                        AU
           e                        AV
           f                        AW
           g                        AX
           h                        AY
           i                        AZ
           j                        B1
           k                        B2
           l                        B3
           m                        B4
           n                        B5
           o                        B6
           p                        B7
           q                        B8
           r                        B9

4v5o-pdb-bundle2.pdb:
           A                        BA
           B                        BB
           C                        BC
           D                        BD
           E                        BE
           F                        BF
           G                        BG
           H                        BH
           I                        BI
           J                        BJ
           K                        BK
           L                        BL
           M                        BM
           N                        BN
           O                        BO
           P                        BP
           Q                        BQ
           R                        BR
           S                        BS
           T                        BT
           U                        BU
           V                        BV
           W                        BW
           X                        BX
           Y                        BY
           Z                        BZ
