    New chain ID            Original chain ID

4v7o-pdb-bundle1.pdb:
           A                        AA
           B                        AG
           C                        AH
           D                        AI
           E                        AJ
           F                        AK
           G                        AL
           H                        AB
           I                        AM
           J                        AN
           K                        AO
           L                        AP
           M                        AQ
           N                        AR
           O                        AC
           P                        AS
           Q                        AT
           R                        AU
           S                        AV
           T                        AW
           U                        AX
           V                        AD
           W                        AY
           X                        AZ
           Y                        A1
           Z                        A2
           a                        A3
           b                        A4
           c                        AE
           d                        A5
           e                        A6
           f                        AF
           g                        A7
           h                        A8
           i                        BA
           j                        BB
           k                        BC
           l                        BD
           m                        BE
           n                        BF
           o                        BG
           p                        BH
           q                        BI
           r                        BJ
           s                        BK

4v7o-pdb-bundle2.pdb:
           A                        BL
           B                        BM
           C                        BN
           D                        BO
           E                        BP
           F                        BQ
           G                        BR
           H                        BS
           I                        BT
           J                        BU
           K                        BV
           L                        BW
           M                        BX
           N                        BY
           O                        BZ
           P                        B1
           Q                        B2
           R                        B3
           S                        B4
           T                        B5
           U                        B6
           V                        B7
           W                        B8
