    New chain ID            Original chain ID

7pk6-pdb-bundle1.pdb:
           A                         A
           B                         B
           K                         K
           P                         P
           L                         L
           Q                         Q
           M                         M
           R                         R
           N                         N
           S                         S
           O                         O
           T                         T
           C                         C
           G                         G
           D                         D
           H                         H

7pk6-pdb-bundle2.pdb:
           E                         E
           I                         I
           F                         F
           J                         J
