    New chain ID            Original chain ID

7m2v-pdb-bundle1.pdb:
           A                         A
           B                         B
           C                         C
           D                         E
           E                         J
           F                         M
           G                        HH
           H                        II
           I                        JJ
           J                        QQ
           K                        FX
           L                         S
           M                         h
           N                         D
           O                        KK
           P                         G
           Q                         V
           R                        ww
           S                         k
           T                         H
           U                         T
           V                        GG
           W                         U
           X                         I
           Y                         X
           Z                         m
           a                         L
           b                        TT
           c                         i
           d                         O
           e                         P
           f                         e
           g                         K
           h                         Y
           i                         n
           j                        ff
           k                        xx
           l                        NN
           m                        yy
           n                        zz
