    New chain ID            Original chain ID

6m8p-pdb-bundle1.pdb:
           A                         A
           B                         B
           C                         C
           D                         D
           E                         E
           F                         F
           G                         G
           H                         H
           I                         I
           J                         J
           K                         K
           L                         L
           M                         M
           N                         N

6m8p-pdb-bundle2.pdb:
           A                         O
           B                         P
           C                         Q
           D                         R
           E                         S
           F                         T
           G                         U
           H                         V
           I                         W
           J                         X
           K                         Y
           L                         Z
           M                         a
           N                         b
           O                         c
           P                         d
           Q                         e
           R                         f
           S                         g
           T                         h
           U                         i
           V                         j
           W                         k
           X                         l
           Y                         m
           Z                         n
           a                         o
           b                         p
           c                         q
           d                         r
           e                         s
           f                         t
           g                         u
           h                         v
           i                         w
           j                         x
           k                         y
           l                         z
           m                         0
           n                         1
           o                         2
           p                         3
           q                         4
           r                         5
           s                         6
           t                         7
           u                         8
           v                         9
           w                        AA
           x                        BA
           y                        CA
           z                        DA
