    New chain ID            Original chain ID

6k3i-pdb-bundle1.pdb:
           A                        AA
           B                        AB
           C                        AC
           D                        AD
           E                        AE
           F                        AF
           G                        AG
           H                        AH
           I                        AI
           J                        AJ
           K                        AK
           L                        BA
           M                        BB
           N                        BC
           O                        BD
           P                        BE
           Q                        BF
           R                        BG
           S                        BH
           T                        BI
           U                        BJ
           V                        BK
           W                        CA
           X                        CB
           Y                        CC
           Z                        CD
           a                        CE
           b                        CF
           c                        CG
           d                        CH
           e                        CI
           f                        CJ
           g                        CK

6k3i-pdb-bundle2.pdb:
           A                        DA
           B                        DB
           C                        DC
           D                        DD
           E                        DE
           F                        DF
           G                        DG
           H                        DH
           I                        DI
           J                        DJ
           K                        DK
           L                        EA
           M                        EB
           N                        EC
           O                        ED
           P                        EE
           Q                        EF
           R                        EG
           S                        EH
           T                        EI
           U                        EJ
           V                        EK
           W                        FA
           X                        FB
           Y                        FC
           Z                        FD
           a                        FE
           b                        FF
           c                        FG
           d                        FH
           e                        FI
           f                        FJ
           g                        FK
