Nat. Biotechnol. 21, 1047–1054 (2003)

The above report failed to cite a relevant paper by Gary Hathaway and colleagues at the California Institute of Technology (Pasadena, CA, USA) entitled “Identification of Phosphorylated and Glycosylated Sites in Peptides by Chemically Targeted Proteolysis,” which was published in the December 2002 issue of the Journal of Biomolecular Techniques (13, 228–237, 2002; http://jbt.abrf.org/cgi/reprint/13/4/228) while the Nature Biotechnology paper was in review. The two papers describe essentially the same chemistry aimed at producing aminoethylcysteine in place of phosphoserine or phosphothreonine residues for the purpose of generating proteolytic cleavage at sites of phosphorylation.