    New chain ID            Original chain ID

9bru-pdb-bundle1.pdb:
           7                         7
           8                         8
           9                         9
           Q                         Q
           R                         R
           T                         T
           V                         V
           6                         6
           U                         U
           a                         a
           e                         e
           f                         f
           b                         b
           g                         g
           h                         h
           i                         i
           j                         j
           k                         k
           l                         l
           m                         m
           n                         n
           o                         o
           X                         X
           d                         d
           c                         c
           p                         p
           1                         1
           0                         0
           2                         2
           3                         3
           4                         4
           5                         5
