Hello Charles and other Users, 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 am not sure if this is the correct use of 'or' and 'and' in the expression. Thank you very much for any suggestion. Best regards, Qi
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