    New chain ID            Original chain ID

8f2n-pdb-bundle1.pdb:
           A                         A
           B                         B
           C                         C
           D                         D
           E                         E
           F                         F
           G                         G
           H                         H
           I                         I
           J                         J
           K                         K
           L                         L
           M                         M
           N                         N
           O                         O
           P                         P
           Q                         Q
           R                         R
           S                         S
           T                         T
           U                         U
           V                         V
           W                         W
           X                         X
           Y                         Y
           Z                         Z
           a                        AA
           b                        AB

8f2n-pdb-bundle2.pdb:
           A                        AC
           B                        AD
           C                        AE
           D                        AF
           E                        AG
           F                        AH
           G                        AI
           H                        AJ
           I                        AK
           J                        AL
           K                        AM
           L                        AN
           M                        AO
           N                        AP
           O                        AQ
           P                        AR
           Q                        AS
           R                        AT
           S                        AU
