    New chain ID            Original chain ID

7bl3-pdb-bundle1.pdb:
           A                         A
           B                         B
           C                        9P
           D                         b
           E                         C
           F                         D
           G                         E
           H                         G
           I                         J
           J                         L
           K                         N
           L                         O
           M                         Q
           N                         R
           O                         S
           P                         T
           Q                         U
           R                         V
           S                         W
           T                         X
           U                         Y
           V                         Z
           W                         0
           X                         1
           Y                         2
           Z                         I
           a                         K
           b                         P
           c                         6
           d                         H
           e                         F
