Shiftcor compares, identifies, corrects and re-referencs 1H, 13C and 15N backbone chemical shifts of peptides and proteins by comparing the observed chemical shifts with the predicted chemical shifts derived from the 3D structure (PDB corrdinates) of the protein(s)of interest.
the Wishart Research Group, University of Alberta
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Haiyan Zhang, Stephen Neal and David Wishart (2003)
“RefDB: A database of uniformly referenced protein chemical shifts”
Journal of Biomolecular NMR, 25: 173-195