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Firstly, making the assumption that you are moving assignments between chains, as Brian mentioned, Copy Chain Assignments is the best way to go. Failing that the next best method is to deassign the residues for the spin systems, then reassign the spin systems to new residues. Working at the resonance level can be very tedious. > 1. When trying to deassign all resonances for a chain by selecting them > all in the resonance popup and pressing the Deassign button, the > resonances become disassociated from their chain but still carry some > sort of assignment string and live on (visible when selecting "Any" > chain). (maybe related to 2) This information is intended and is essential if you wish to change the residue to which the resonance was assigned. In essence the model remebers the type of atoms that were assigned previously, so that you have to do minimal work when the resonance (or spin system) is connected to a new residue. Such legacy information will be discarded and ignored if you assign a resonance to a specific new atom set. > 2. When trying to deassign all resonances for a chain by selecting them > all in the resonance popup and pressing the Deassign button, we get > offered the option to remove the resonance assignments from the peaks by > another popup, but this doesn't seem to work (or maybe just does one?). > Workaround is to display all the peaks using the Show Total peaks button > and deassign from there. I'll look into this. > 3. When deleting the last chain of a molecular template we are offered > the option to delete the molecular template too, but get the traceback > below because the molecular template is locked. Workaround is to unlock > and delete from the molecular template dialog, but would be more elegant > if the popup either didn't appear or had the power to do what it > offered! Yes, indeed. This did work just fine! The model has changed slightly since the creation of this popup and its difficult to keep up with everything. I will do the required re-fit... T. ------------------------------------------------------------------------------- Dr Tim Stevens Email: [log in to unmask] Department of Biochemistry [log in to unmask] University of Cambridge Phone: +44 1223 766018 (office) 80 Tennis Court Road +44 7816 338275 (mobile) Old Addenbrooke's Site +44 1223 364613 (home) Cambridge CB2 1GA WWWeb: http://www.bio.cam.ac.uk/~tjs23 United Kingdom http://www.pantonia.co.uk ------------------------------------------------------------------------------- ------ +NH3CH(CH(CH3)OH)C(O)NHCH(CH(CH3)CH2CH3)C(O)NHCH(CH2CH2SCH3)CO2- ------- -------------------------------------------------------------------------------