    New chain ID            Original chain ID

5zlu-pdb-bundle1.pdb:
           W                         W
           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
           O                         O
           P                         P
           Q                         Q
           R                         R
           S                         S
           T                         T
           U                         U

5zlu-pdb-bundle2.pdb:
           A                         V
           B                         X
           C                         Y
           D                         Z
           E                         a
           F                         b
           G                         c
           H                         d
           I                         e
           J                         f
           K                         g
           L                         h
           M                         i
           N                         j
           O                         k
           P                         l
           Q                         m
           R                         n
           S                         o
           T                         p
           U                         q
           V                         r
           W                         s
           X                         t
           Y                         u
           Z                         v
           a                         w
           b                         x
           c                         y
           d                         z
           e                        AA
           f                        BB
           g                        CC
           h                        DD
           i                        EE
