    New chain ID            Original chain ID

6tz4-pdb-bundle1.pdb:
           A                        JB
           B                        MB
           C                         A
           D                         B
           E                         C
           F                         D
           G                         E
           H                         F
           I                         G
           J                         H
           K                         I
           L                         J
           M                         K
           N                         L
           O                         M
           P                         N
           Q                         O
           R                         P
           S                         Q
           T                         R
           U                         S
           V                         T
           W                         V
           X                         W
           Y                         X
           Z                         Y
           a                         Z
           b                        AA
           c                        BA
           d                        CA
           e                        DA
           f                        EA
           g                        FA
           h                        GA
           i                        HA
           j                        IA
           k                        JA
           l                        KA
           m                        LA
           n                        MA
           o                        NA
           p                        OA
           q                        PA
           r                        QA
           s                        RA
           t                        SA
           u                        TA
           v                        UA
           w                        VA
           x                        WA
           y                        XA
           z                        YA
           0                        ZA
           1                        AB
           2                        BB
           3                        CB
           4                        DB
           5                        EB
           6                        FB
           7                        GB
           8                        HB
           9                        IB

6tz4-pdb-bundle2.pdb:
           A                        LB
           B                        KB
           C                        NB
           D                        OB
           E                        PB
           F                        QB
           G                        RB
           H                        SB
           I                        02
           J                        01
