    New chain ID            Original chain ID

8gtf-pdb-bundle1.pdb:
           M                         M
           N                         N
           O                         O
           P                         P
           Q                         Q
           X                         X
           e                         e
           f                         f
           g                         g
           h                         h
           i                         i
           j                         j
           k                         k
           l                         l
           m                         m
           n                         n
           o                         o
           p                         p
