    New chain ID            Original chain ID

4v6u-pdb-bundle1.pdb:
           A                        AQ
           B                        AK
           C                        AI
           D                        AG
           E                        AW
           F                        AC
           G                        AB
           H                        AR
           I                        A9
           J                        AD
           K                        A1
           L                        AN
           M                        AX
           N                        AM
           O                        AE
           P                        AJ
           Q                        AO
           R                        AF
           S                        AS
           T                        A3
           U                        A2
           V                        AY
           W                        AT
           X                        AA
           Y                        AH
           Z                        AP
           a                        A0
           b                        AV
           c                        AL
           d                        AU
           e                        BY
           f                        BO
           g                        BC
           h                        B5
           i                        BL
           j                        Bf
           k                        BU
           l                        Bb
           m                        Be
           n                        BE
           o                        Ba
           p                        BT
           q                        Bk
           r                        BW
           s                        Bi
           t                        BA
           u                        BI
           v                        BR
           w                        BK
           x                        BQ
           y                        BV
           z                        Bj
           0                        BB
           1                        BG
           2                        BD
           3                        BF
           4                        Bh
           5                        BH
           6                        BZ
           7                        B6
           8                        BP
           9                        BM

4v6u-pdb-bundle2.pdb:
           A                        BS
           B                        Bd
           C                        BN
           D                        Bg
           E                        B4
           F                        Bc
           G                        BJ
           H                        Bl
           I                        B1
           J                        B3
