    New chain ID            Original chain ID

9fq6-pdb-bundle1.pdb:
           A                         A
           B                         B
           C                         C
           E                         E
           F                         F
           G                         G
           I                         I
           J                         J
           L                         L
           O                         O
           Q                         Q
           R                         R
           S                         S
           U                         U

9fq6-pdb-bundle2.pdb:
           Y                         Y
