    New chain ID            Original chain ID

9zna_1-pdb-bundle1.pdb:
           A                         E
           B                         I
           C                         J
           D                         K
           E                         L
           F                         F
           G                         G
           H                         H
           I                         A
           J                         B
           K                         C
9zna_1-pdb-bundle2.pdb:
           A                         C
           B                         D
