    New chain ID            Original chain ID

8b3p-pdb-bundle1.pdb:
           A                       AAA
           B                       FFF
           C                       KKK
           D                       PPP
           E                       UUU
           F                       ZZZ
           G                       eee
           H                       jjj
           I                       ooo
           J                       ttt
           K                       yyy
           L                       BBB
           M                       GGG
           N                       LLL
           O                       QQQ
           P                       VVV
           Q                       aaa
           R                       fff
           S                       kkk
           T                       ppp
           U                       uuu
           V                       222
           W                       CCC
           X                       HHH
           Y                       MMM
           Z                       RRR
           a                       WWW
           b                       bbb
           c                       ggg
           d                       lll
           e                       qqq
           f                       vvv
           g                       111
           h                       DDD
           i                       III
           j                       NNN
           k                       SSS
           l                       XXX
           m                       ccc
           n                       hhh
           o                       mmm
           p                       rrr
           q                       www
           r                       zzz
           s                       EEE
           t                       JJJ
           u                       OOO
           v                       TTT
           w                       YYY
           x                       ddd
           y                       iii
           z                       nnn
           0                       sss
           1                       xxx
           2                       333
