    New chain ID            Original chain ID

9on4-pdb-bundle1.pdb:
           A                         A
           B                         B
           C                         C
           D                         D
           E                         E
           F                         F
           G                         G
           H                         H
           I                        IA
           J                        JA
           K                        KA
           L                        LA
           M                        MA
           N                        NA
           O                        PA
           P                        OA
