    New chain ID            Original chain ID

4tvx-pdb-bundle1.pdb:
           W                         W
           V                         V
           K                         K
           J                         J
           F                         F
           D                         D
           E                         E
           C                         C
           B                         B
           G                         G
           A                         A
           H                         H
           R                         R
           P                         P
           Q                         Q
           O                         O
           N                         N
           S                         S
           T                         T
           M                         M
           L                         L
           X                         X
           U                         U

4tvx-pdb-bundle2.pdb:
           I                         I
