    New chain ID            Original chain ID

8btk_1-pdb-bundle1.pdb:
           A                        BA
           B                        BB
           C                        BC
           D                        BD
           E                        BE
           F                        BF
           G                        BG
           H                        BH
           I                        BI
           J                        BJ
           K                        BL
           L                        BM
           M                        BN
           N                        BO
           O                        BP
           P                        BQ
           Q                        BR
           R                        BS
           S                        BT
           T                        BU
           U                        BV
           V                        BW
           W                        BX
           X                        BY
           Y                        BZ
           Z                        Ba
           a                        Bb
           b                        Bc
           c                        Bd
           d                        Be
           e                        Bf
           f                        Bg
           g                        Bh
           h                        Bi
           i                        Bj
           j                        Bk
           k                        Bl
           l                        Bm
           m                        Bo
           n                        Bp
           o                        Br
           p                        Bs
           q                        Bt
           r                        Bv
           s                        SX
           t                        SY
           u                        AA
           v                        AB
           w                        AC
           x                        AD
           y                        AE
           z                        AF
           0                        AG
           1                        AZ
           2                        Aa
           3                        Ab
           4                        Ac
           5                        Ad
           6                        Ae
           7                        Af
           8                        Ag
           9                        Ah
8btk_1-pdb-bundle2.pdb:
           A                        Ai
           B                        Aj
           C                        Ak
           D                        Al
           E                        Am
           F                        An
           G                        Ao
           H                        Ap
           I                        Aq
           J                        Ar
           K                        As
           L                        At
           M                        Au
           N                        Av
           O                        Aw
           P                        Ax
8btk_1-pdb-bundle3.pdb:
           A                        Ax
           B                        Ay
           C                        TA
           D                        TB
           E                        TC
           F                        TD
