    New chain ID            Original chain ID

9y8p-pdb-bundle1.pdb:
           A                         U
           B                         A
           C                         B
           D                         C
           E                         D
           F                         E
           G                         F
           H                         G
           I                         H
           J                         I
           K                         J
           L                         K
           M                         L
           N                         M
           O                         N
           P                         O
           Q                         P
           R                         Q
           S                         R
           T                         S
           U                         T
           V                         V
           W                         W
           X                         X
           Y                         Y
           Z                         Z
           a                        AA
           b                        BA
           c                        CA
           d                        DA
           e                        EA
           f                        FA
           g                        GA
           h                        HA
           i                        IA
           j                        JA
           k                        KA
           l                        LA
           m                        MA
           n                        NA
           o                        OA
           p                        PA
           q                        QA
           r                        RA
           s                        SA
           t                        TA

9y8p-pdb-bundle2.pdb:
           A                        UA
           B                        VA
           C                        WA
           D                        XA
           E                        YA
           F                        ZA
           G                        AB
           H                        BB
           I                        CB
           J                        DB
           K                        EB
           L                        FB
           M                        GB
           N                        HB
