    New chain ID            Original chain ID

7bl2-pdb-bundle1.pdb:
           A                         A
           B                         B
           C                       9P1
           D                         C
           E                         D
           F                         E
           G                         G
           H                         J
           I                         L
           J                         N
           K                         O
           L                         Q
           M                         R
           N                         S
           O                         T
           P                         U
           Q                         V
           R                         W
           S                         X
           T                         Y
           U                         Z
           V                         0
           W                         1
           X                         2
           Y                         I
           Z                         K
           a                         P
           b                         6
           c                         H
           d                         F
           e                         b
