    New chain ID            Original chain ID

3j9w-pdb-bundle1.pdb:
           A                        AA
           B                        AB
           C                        AC
           D                        AD
           E                        AE
           F                        AF
           G                        AG
           H                        AH
           I                        AI
           J                        AJ
           K                        AK
           L                        AL
           M                        AM
           N                        AN
           O                        AO
           P                        AP
           Q                        AQ
           R                        AR
           S                        AS
           T                        AT
           U                        AX
           V                        AY
           W                        AZ
           X                        B0
           Y                        B1
           Z                        B2
           a                        B3
           b                        B4
           c                        B5
           d                        B6
           e                        B7
           f                        B8

3j9w-pdb-bundle2.pdb:
           A                        BA
           B                        BB
           C                        BD
           D                        BE
           E                        BF
           F                        BG
           G                        BH
           H                        BJ
           I                        BK
           J                        BM
           K                        BN
           L                        BO
           M                        BP
           N                        BQ
           O                        BR
           P                        BS
           Q                        BT
           R                        BU
           S                        BV
           T                        BW
           U                        BX
           V                        BZ
