Hello Qi--
>
> I am doing rigid body modeling based on a crystal structure and have a
> question
> about the atom selection. There are 10 individual chains named A to J.
> I wanted to fix all atoms of chain A, B and C, and the backbone of chain D,
> residues 50-60.
> I am not sure if the following expression would do it.
>
> ((segid A and resid 1:100) or (segid B and resid 1:100) or (segid C and resid
> 1:100)) and (name C* or name O* or name N* or name S* or name H*)) or ((segid
> D
> and resid 50:60) and (name C or name CA or name N or name O or name HN or name
> HA*))
I think you want:
"""segid A or
segid B or
segid C or
(segid D and resid 50:60 and (name C or name CA or name N or name O or
name HN or name HA*))"""
best regards--
Charles
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