    New chain ID            Original chain ID

7t81-pdb-bundle1.pdb:
           A                         A
           C                         C
           D                         D
           E                         E
           F                         F

7t81-pdb-bundle2.pdb:
           G                         G
           H                         H
           I                         I
           J                         J
           K                         K

7t81-pdb-bundle3.pdb:
           L                         L
           M                         M
           N                         N
           O                         O
           P                         P

7t81-pdb-bundle4.pdb:
           Q                         Q
           R                         R
           S                         S
           T                         T
           U                         U

7t81-pdb-bundle5.pdb:
           V                         V
           W                         W
           X                         X
           Y                         Y
