    New chain ID            Original chain ID

9l0a-pdb-bundle1.pdb:
           A                         A
           B                         B
           C                         C
           D                         D
           E                         E
           F                         F
           G                         I
           H                         J
           I                         K
           J                         L
           K                         M
           L                         X
           M                        bA
           N                        bB
           O                        bC
           P                        bD
           Q                        bE
           R                        bF
           S                        bI
           T                        bJ
           U                        bK
           V                        bL
           W                        bM
           X                        bX
           Y                        cA
           Z                        cB
           a                        cC
           b                        cD
           c                        cE
           d                        cF
           e                        cI
           f                        cJ
           g                        cK
           h                        cL
           i                        cM
           j                        cX
