    New chain ID            Original chain ID

4v5z-pdb-bundle1.pdb:
           A                        AA
           B                        AB
           C                        AC
           D                        AD
           E                        AE
           F                        AF
           G                        AG
           H                        AH
           I                        Aa
           J                        Ab
           K                        Ac
           L                        Ad
           M                        Ae
           N                        Ag
           O                        Ah
           P                        Ai
           Q                        Aj
           R                        Ak
           S                        Al
           T                        Am
           U                        An
           V                        Ao
           W                        Aq
           X                        As
           Y                        B1
           Z                        B0
           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
           0                        Ba
           1                        Bb
           2                        Bc
           3                        Bd
           4                        Be
           5                        Bf
           6                        Bg
           7                        Bh
           8                        Bi
           9                        Bj

4v5z-pdb-bundle2.pdb:
           A                        Bk
           B                        Bl
           C                        Bm
           D                        Bn
           E                        Bo
           F                        Bp
           G                        B7
           H                        Bq
           I                        Br
           J                        Bs
           K                        Bt
           L                        Bu
           M                        Bv
           N                        B8
           O                        Bw
           P                        Bx
           Q                        By
           R                        B9
           S                        Bz
           T                        B2
           U                        B3
           V                        B4
           W                        B5
           X                        B6
