    New chain ID            Original chain ID

28ym-pdb-bundle1.pdb:
           A                         A
           B                        AA
           C                        AB
           D                        AC
           E                        AD
           F                        AE
           G                        AF
           H                        AG
           I                        AH
           J                        AI
           K                        AJ
           L                        AK
           M                        AL
           N                        AM
           O                        AN
           P                         B
           Q                         C
           R                         D
           S                         E
           T                         F
           U                         G
           V                         H
           W                         I
           X                         J
           Y                         K
           Z                         L
           a                         M
           b                         N
           c                         O
           d                         P
           e                         Q
           f                         R
           g                         S
           h                         T
           i                         U
           j                         V
           k                         W
           l                         X
           m                         Y
           n                         Z
