    New chain ID            Original chain ID

4v88_1-pdb-bundle1.pdb:
           A                        AA
           B                        AB
           C                        AC
           D                        AD
           E                        AE
           F                        AF
           G                        AG
           H                        AH
           I                        AI
           J                        AJ
           K                        AK
           L                        AL
           M                        AM
           N                        AN
           O                        AO
           P                        AP
           Q                        AQ
           R                        AR
           S                        AS
           T                        AT
           U                        AU
           V                        AV
           W                        AW
           X                        AX
           Y                        AY
           Z                        AZ
           a                        Aa
           b                        Ab
           c                        Ac
           d                        Ad
           e                        Ae
           f                        Af
           g                        Ag
           h                        Ah
           i                        BA
           j                        BB
           k                        BC
           l                        BD
           m                        BE
           n                        BF
           o                        BG
           p                        BH
           q                        BI
           r                        BJ
           s                        BL
           t                        BM
           u                        BN
           v                        BO
           w                        BP
           x                        BQ
           y                        BR
           z                        BS
           0                        BT
           1                        BU
           2                        BV
           3                        BW
           4                        BX
           5                        BY
           6                        BZ
           7                        Ba
           8                        Bb
           9                        Bc
4v88_1-pdb-bundle2.pdb:
           A                        Bd
           B                        Be
           C                        Bf
           D                        Bg
           E                        Bh
           F                        Bi
           G                        Bj
           H                        Bk
           I                        Bl
           J                        Bm
           K                        Bo
           L                        Bp
