    New chain ID            Original chain ID

8r8b-pdb-bundle1.pdb:
           A                       AAA
           B                       BBB
           C                       CCC
           D                       DDD
           E                       EEE
           F                       FFF
           G                       GGG
           H                       HHH
           I                       III
           J                       JJJ
           K                       KKK
           L                       LLL
           M                       MMM
           N                       NNN
           O                       OOO
           P                       PPP
           Q                       QQQ
           R                       RRR
           S                       SSS
           T                       TTT
           U                       UUU
           V                       VVV
           W                       WWW
           X                       XXX
           Y                       aaa
           Z                       bbb
           a                       ccc
           b                       ddd
           c                       eee
           d                       fff
           e                       ggg
           f                       hhh
           g                       iii
           h                       jjj
           i                       kkk
           j                       lll
           k                       mmm
           l                       nnn
           m                       ooo
           n                       ppp
           o                       qqq
           p                       rrr
           q                       sss
           r                       ttt
           s                       uuu
           t                       vvv
           u                       www
           v                       xxx
