    New chain ID            Original chain ID

7rd1_2-pdb-bundle1.pdb:
           A                         A
           B                         B
           C                         C
           D                         D
           E                         E
           F                         F
           G                         G
7rd1_2-pdb-bundle2.pdb:
           A                         G
           B                         H
           C                         I
           D                         J
           E                         K
           F                         L
           G                         M
           H                         N
           I                         O
           J                         P
           K                         Q
           L                         R
           M                         S
           N                         T
