Hi Ellen,
Because you only have backbone (and CB) chemical shifts the assignment information from the peak list is probably linked incorrectly to the residues in CCPN - the algorithm to connect these is not so sophisticated so unless you have side chain information it will happily link the info from your format file to the CCPN info with an offset.
If you re-import the peak list, but click 'No' for the 'Automatic linking' popup, you should get a window where you can correctly connect the sequence codes that are in your peak list to the residue sequence codes already in CCPN.
Bye,
Wim
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