    New chain ID            Original chain ID

9v29-pdb-bundle1.pdb:
           A                        sB
           B                        sC
           C                        sI
           D                        sJ
           E                        sK
           F                        sa
           G                        sb
           H                        sc
           I                        se
           J                        sf
           K                        sh
           L                        si
           M                        sj
           N                        sk
           O                        sm
           P                        so
           Q                        sp
           R                        sr
           S                        sy
