    New chain ID            Original chain ID

4v4b-pdb-bundle1.pdb:
           A                        AA
           B                        AT
           C                        AB
           D                        AC
           E                        AD
           F                        AE
           G                        AG
           H                        AH
           I                        AI
           J                        AJ
           K                        AK
           L                        AL
           M                        AM
           N                        AN
           O                        AO
           P                        AQ
           Q                        AS

4v4b-pdb-bundle2.pdb:
           A                        B3
           B                        B4
           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                        B0
           Z                        BW
           a                        BX
           b                        BY
           c                        BZ
           d                        B9
