    New chain ID            Original chain ID

8fkx-pdb-bundle1.pdb:
           A                        BA
           B                        BB
           C                        L1
           D                        L2
           E                        L3
           F                        L6
           G                        L7
           H                        L8
           I                        L9
           J                        LA
           K                        LB
           L                        LC
           M                        LE
           N                        LG
           O                        LH
           P                        LI
           Q                        LK
           R                        LL
           S                        LN
           T                        LP
           U                        LQ
           V                        LS
           W                        LT
           X                        LU
           Y                        LW
           Z                        NA
           a                        NB
           b                        NF
           c                        NH
           d                        NI
           e                        NK
           f                        SA
           g                        SC
           h                        SD
           i                        SE
           j                        SG

8fkx-pdb-bundle2.pdb:
           A                        SH
           B                        SI
           C                        SJ
           D                        SK
           E                        SL
           F                        SM
           G                        SN
           H                        SO
           I                        SQ
           J                        SR
           K                        SS
           L                        ST
           M                        SU
           N                        SV
           O                        SW
           P                        SY
           Q                        SZ
