    New chain ID            Original chain ID

9d49-pdb-bundle1.pdb:
           A                         A
           B                         B
           E                         E
           F                         F
           I                         I
           J                         J
           M                         M

9d49-pdb-bundle2.pdb:
           N                         N
           Q                         Q
           R                         R
           U                         U
           V                         V
