    New chain ID            Original chain ID

8cs9-pdb-bundle1.pdb:
           A                         A
           K                         K
           L                         L
           Q                         Q
           X                         X
           P                         P
           R                         R
           a                         a
           V                         V
           e                         e
           S                         S
           b                         b
           Y                         Y
           f                         f
           T                         T
           c                         c
           Z                         Z
           g                         g
           B                         B
           C                         C
           D                         D
