    New chain ID            Original chain ID

4v49-pdb-bundle1.pdb:
           A                        AA
           B                        AV
           C                        AU
           D                        AW
           E                        AB
           F                        AC
           G                        AD
           H                        AE
           I                        AF
           J                        AG
           K                        AH
           L                        AI
           M                        AJ
           N                        AK
           O                        AL
           P                        AM
           Q                        AN
           R                        AO
           S                        AP
           T                        AQ
           U                        AR
           V                        AS
           W                        AT

4v49-pdb-bundle2.pdb:
           A                        B0
           B                        B9
           C                        BA
           D                        BB
           E                        BC
           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                        B1
           d                        B2
           e                        B3
           f                        B4
           g                        B5
