    New chain ID            Original chain ID

7un1-pdb-bundle1.pdb:
           A                         A
           B                        AB
           C                        AC
           D                        AD
           E                        AE
           F                        AF
           G                         B
           H                        BA
           I                        BC
           J                        BD
           K                        BE
           L                        BF
           M                        BG
           N                         C
           O                        CB
           P                        CC
           Q                        CD
           R                        CE
           S                        CF
           T                        CG
           U                         D
           V                        DB
           W                        DC
           X                        DD
           Y                        DE
           Z                        DF
           a                        DG
           b                         E
           c                        EB
           d                        EC
           e                        ED
           f                        EE
           g                        EF

7un1-pdb-bundle2.pdb:
           A                        EG
           B                         F
           C                        FC
           D                        FD
           E                        FE
           F                        FF
           G                        FG
           H                        FH
           I                         G
           J                        GC
           K                        GD
           L                        GE
           M                        GF
           N                        GG
           O                        GH
           P                         H
           Q                        HC
           R                        HD
           S                        HE
           T                        HF
           U                        HG
           V                        HH
           W                         I
           X                        IC
           Y                        ID
           Z                        IE
           a                        IF
           b                        IG
           c                        IH
           d                         J
           e                        JC
           f                        JD

7un1-pdb-bundle3.pdb:
           A                        JE
           B                        JF
           C                        JG
           D                         K
           E                        KC
           F                        KD
           G                        KE
           H                        KF
           I                        KG
           J                        KH
           K                         L
           L                        LA
           M                        LB
           N                        LC
           O                        LD
           P                        LE
           Q                        LF
           R                         M
           S                        MA
           T                        MB
           U                        MC
           V                        MD
           W                        ME
           X                        MF
           Y                         N
           Z                         O
           a                         P
           b                         Q
           c                         R
           d                         S
           e                         T
           f                         U
           g                         V
           h                         W
           i                         X
           j                         d
           k                         e
           l                         f
           m                         g
           n                         h
           o                         i
           p                         j
           q                         k
           r                         l
