    New chain ID            Original chain ID

7ax3-pdb-bundle1.pdb:
           A                        C2
           B                        D2
           C                        A2
           D                        B2
           E                         A
           F                         B
           G                         C
           H                         D
           I                         E
           J                         F
           K                         G
           L                         H
           M                         I
           N                         J
           O                         K
           P                         L
           Q                         M
           R                         N
           S                         O
           T                         P
           U                         Q

7ax3-pdb-bundle2.pdb:
           A                         R
           B                         S
           C                         T
           D                         U
           E                         V
           F                         W
           G                         X
           H                         Y
           I                         Z
           J                        E2
           K                        F2
           L                        G2
           M                        H2
           N                        I2
           O                        J2
