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Azmiri, > 'segid A and resid 9:69 > and segid A and resid 146:236 > and segid A and resid 246:276' try: (segid A and resid 9:69) or (segid A and resid 146:236) , etc Basically, your original selection is trying to select all residues where the residue number is both in the range 9:69 and 146:236 and 246:276. No residue will match all of those ranges, so you end up with an empty selection. I've run into a similar situation when I was first doing rigid-body selections in cns. Hopefully this will help, if using or doesn't work it's probably a problem somewhere else. Pete Pete Meyer Fu Lab BMCB grad student Cornell University
