    New chain ID            Original chain ID

4v9e-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                        Aa
           T                        Ag
           U                        Am
           V                        BA
           W                        BB
           X                        BC
           Y                        BD
           Z                        BE
           a                        BF
           b                        BG
           c                        BH
           d                        BI
           e                        BJ
           f                        BK
           g                        BL
           h                        BM
           i                        BN
           j                        BO
           k                        BP
           l                        BQ
           m                        BR
           n                        Ba
           o                        Bg
           p                        Bm
