    New chain ID            Original chain ID

7s78_2-pdb-bundle1.pdb:
           A                         A
           B                         B
           C                         C
           D                         D
           E                         E
           F                         F
           G                         G
           H                         H
           I                         I
           J                         J
           K                         K
           L                         L
           M                         N
           N                         M
           O                         P
           P                         Q
           Q                         R
           R                         S
           S                         U
7s78_2-pdb-bundle2.pdb:
           A                         U
           B                         V
           C                         W
           D                         X
           E                         Y
           F                         1
           G                         3
