    New chain ID            Original chain ID

8gtb-pdb-bundle1.pdb:
           B                         B
           A                         A
           C                         C
           D                         D
           E                         E
           F                         F
           I                         I
           G                         G
           K                         K
           M                         M
           O                         O
           Q                         Q
           J                         J
           H                         H
           L                         L
           N                         N
           P                         P
           R                         R
