    New chain ID            Original chain ID

6mtc-pdb-bundle1.pdb:
           4                         4
           5                         5
           7                         7
           8                         8
           A                         A
           B                         B
           C                         C
           D                         D
           E                         E
           F                         F

6mtc-pdb-bundle2.pdb:
           A                         G
           B                         H
           C                         I
           D                         J
           E                         L
           F                         M
           G                         N
           H                         O
           I                         P
           J                         Q
           K                         R
           L                         S
           M                         T
           N                         U
           O                         V
           P                         W
           Q                         X
           R                         Y
           S                         Z
           T                         a
           U                         b
           V                         c
           W                         d
           X                         e
           Y                         f
           Z                         g
           a                         h
           b                         i
           c                         j
           d                         k
           e                         l
           f                         m
           g                         n
           h                         o
           i                         p
           j                         r
           k                         u
           l                         v
           m                         9
           n                        AA
           o                        BB
           p                        CC
           q                        DD
           r                        EE
           s                        FF
           t                        GG
           u                        HH
           v                        II
           w                        JJ
           x                        KK
           y                        LL
           z                        MM

6mtc-pdb-bundle3.pdb:
           A                        NN
           B                        OO
           C                        PP
           D                        QQ
           E                        RR
           F                        SS
           G                        TT
           H                        UU
           I                        VV
           J                        WW
           K                        XX
           L                        YY
           M                        ZZ
           N                        aa
           O                        bb
           P                        cc
           Q                        dd
           R                        ee
           S                        ff
           T                        gg
