    New chain ID            Original chain ID

9n8m-pdb-bundle1.pdb:
           A                        M1
           B                        M2
           C                        M3
           D                        M4
           E                        M5
           F                        M6
           G                        M7
           H                        M8
           I                        M9
           J                        MA
           K                        MB
           L                        MC
           M                        MD
           N                        ME
           O                        MF
           P                        MG
           Q                        MH
           R                        MI
           S                        MJ
           T                        MK
           U                        ML
           V                        MM
           W                        MN
           X                        MO
           Y                        MP
           Z                        MQ
           a                        MR
           b                        MS
           c                        MT
           d                        MU
           e                        MV
           f                        MW
           g                        MX
