    New chain ID            Original chain ID

4v6m-pdb-bundle1.pdb:
           A                        AA
           B                        AX
           C                        AV
           D                        AZ
           E                        A0
           F                        A1
           G                        AB
           H                        AC
           I                        AD
           J                        AE
           K                        AF
           L                        AG
           M                        AH
           N                        AI
           O                        AJ
           P                        AK
           Q                        AL
           R                        AM
           S                        AN
           T                        AO
           U                        AP
           V                        AQ
           W                        AR
           X                        AS
           Y                        AT
           Z                        AU
           a                        B7

4v6m-pdb-bundle2.pdb:
           A                        B8
           B                        BA
           C                        BB
           D                        B5
           E                        B6
           F                        BD
           G                        BE
           H                        BF
           I                        BG
           J                        BH
           K                        BI
           L                        BJ
           M                        BK
           N                        BL
           O                        BM
           P                        BN
           Q                        BO
           R                        BP
           S                        BQ
           T                        BR
           U                        BS
           V                        BT
           W                        BU
           X                        BV
           Y                        BW
           Z                        BX
           a                        BY
           b                        BZ
           c                        B0
           d                        B1
           e                        B2
           f                        B3
           g                        B4
