    New chain ID            Original chain ID

9xk4-pdb-bundle1.pdb:
           A                        1a
           B                        1b
           C                        1c
           D                        1d
           E                        1e
           F                        1f
           G                        1h
           H                        1i
           I                        1j
           J                        1k
           K                        1l
           L                        1m
           M                        1o
           N                        1p
           O                        1t
           P                        1u
           Q                        1v
           R                        1w
           S                        1x
           T                        1y
           U                        1z
