    New chain ID            Original chain ID

4bts-pdb-bundle1.pdb:
           A                        A0
           B                        A1
           C                        A2
           D                        A3
           E                        A4
           F                        A5
           G                        A6
           H                        A7
           I                        A8
           J                        A9
           K                        AA
           L                        AB
           M                        AC
           N                        AD
           O                        AE
           P                        AF
           Q                        AG
           R                        AH
           S                        AI
           T                        AJ
           U                        AK
           V                        AL
           W                        AM
           X                        AN
           Y                        AO
           Z                        AP
           a                        AQ
           b                        AR
           c                        AS
           d                        AT
           e                        AU
           f                        AV
           g                        AW
           h                        AX
           i                        AY
           j                        AZ
           k                        B0
           l                        B1
           m                        B2
           n                        B3
           o                        B4
           p                        B5
           q                        B6
           r                        B7
           s                        B8
           t                        B9

4bts-pdb-bundle2.pdb:
           A                        BA
           B                        BB
           C                        BC
           D                        BD
           E                        BE
           F                        BF
           G                        BG
           H                        BH
           I                        BI
           J                        BJ
           K                        BK
           L                        BL
           M                        BM
           N                        BN
           O                        BO
           P                        BP
           Q                        BQ
           R                        BR
           S                        BS
           T                        BT
           U                        BU
           V                        BV
           W                        BW
           X                        BX
           Y                        BY
           Z                        BZ
           a                        C0
           b                        C1
           c                        C2
           d                        C3
           e                        C4
           f                        C5
           g                        C6
           h                        C7
           i                        C8
           j                        C9

4bts-pdb-bundle3.pdb:
           A                        CA
           B                        CB
           C                        CC
           D                        CD
           E                        CE
           F                        CF
           G                        CG
           H                        CH
           I                        CI
           J                        CJ
           K                        CK
           L                        CL
           M                        CM
           N                        CN
           O                        CO
           P                        CP
           Q                        CQ
           R                        CR
           S                        CS
           T                        CT
           U                        CU
           V                        CV
           W                        CW
           X                        CX
           Y                        CY
           Z                        CZ
           a                        D0
           b                        D1
           c                        D2
           d                        D3
           e                        D4
           f                        D5
           g                        D6
           h                        D7
           i                        D8
           j                        D9

4bts-pdb-bundle4.pdb:
           A                        DA
           B                        DB
           C                        DC
           D                        DD
           E                        DE
           F                        DF
           G                        DG
           H                        DH
           I                        DI
           J                        DJ
           K                        DK
           L                        DL
           M                        DM
           N                        DN
           O                        DO
           P                        DP
           Q                        DQ
           R                        DR
           S                        DS
           T                        DT
           U                        DU
           V                        DV
           W                        DW
           X                        DX
           Y                        DY
           Z                        DZ
