    New chain ID            Original chain ID

9j1w-pdb-bundle1.pdb:
           A                         A
           B                        AA
           C                        AB
           D                         B
           E                        BA
           F                        BB
           G                         C
           H                        CA
           I                        CB
           J                         D
           K                        DA
           L                        DB
           M                         E
           N                        EA
           O                        EB
           P                         F
           Q                        FA
           R                        FB
           S                         G
           T                        GA
           U                        GB
           V                         H
           W                        HA
           X                        HB
           Y                         I
           Z                        IA
           a                         J
           b                        JA
           c                         K
           d                        KA
           e                         L
           f                        LA
           g                         M
           h                        MA
           i                         N
           j                        NA
           k                         O
           l                        OA
           m                         P
           n                        PA
           o                         Q
           p                        QA
           q                         R
           r                        RA
           s                         S
           t                        SA
           u                         T
           v                        TA
           w                        UA
           x                         V
           y                        VA
           z                         W
           0                        WA
           1                         X
           2                        XA
           3                         Y

9j1w-pdb-bundle2.pdb:
           A                        YA
           B                         Z
           C                        ZA
           D                         a
