    New chain ID            Original chain ID

9ygu-pdb-bundle1.pdb:
           A                        Y1
           B                        Q2
           C                        I3
           D                        R4
           E                        S5
           F                        g6
           G                        A7
           H                        e8
           I                        Z9
           J                        OA
           K                        FB
           L                        dC
           M                        JD
           N                        KE
           O                        LF
           P                        WG
           Q                        UH
           R                        NI
           S                        BJ
           T                        fK
           U                        HL
           V                        XM
           W                        DN
           X                        MO
           Y                        TP

9ygu-pdb-bundle2.pdb:
           A                        GQ
           B                        VR
           C                        bS
           D                        CT
           E                        PU
           F                        cV
           G                        aW
           H                        EX
