    New chain ID            Original chain ID

9o3z-pdb-bundle1.pdb:
           A                         A
           B                        AB
           C                         B
           D                        BB
           E                         C
           F                        CB
           G                         D
           H                        DB
           I                         E
           J                        EB
           K                         F
           L                        FB
           M                         G
           N                        GB
           O                         H
           P                        HB
           Q                         I
           R                        IB
           S                         J
           T                        JB
           U                         K
           V                        KB
           W                         L
           X                        LB
           Y                         M
           Z                        MB
           a                         N
           b                        NB
           c                         O
           d                        OB
           e                         P
           f                        PB
           g                         Q
           h                        QB
           i                         R
           j                        RB
           k                         S
           l                        SB
           m                         T
           n                        TB
           o                         U
           p                        UB
           q                         V
           r                        VB
           s                         W
           t                        WB
           u                         a
           v                        ab
           w                         b
           x                        bb
           y                         c
           z                        cb
           0                         d
           1                        db
           2                         e
           3                        eb
           4                         f
           5                        fb
           6                         g
           7                        gb
