    New chain ID            Original chain ID

9pgg-pdb-bundle1.pdb:
           A                        Aa
           B                        Ab
           C                        Ac
           D                        Ad
           E                        Ae
           F                        Af
           G                        Ag
           H                        Ah
           I                        Ai
           J                        Aj
           K                        Ak
           L                        Al
           M                        Am
           N                        An
           O                        Ao
           P                        Ap
           Q                        Aq
           R                        Ar
           S                        As
           T                        At
           U                        Au
           V                        Av
           W                        Aw
           X                        Ax
           Y                        Ay
           Z                        Az
           a                        Ba
           b                        Bb
           c                        Bd
           d                        Bf
           e                        Bh
           f                        Bj
           g                        Bl
           h                        Bn

9pgg-pdb-bundle2.pdb:
           A                        Bp
           B                        Br
           C                        Bt
           D                        Bv
           E                        Bx
