The authors of Mol. Biol. Cell [2003] 14, 4003–4014 would like to make a correction to the paper. The title of the paper should be “Regulation of Cdc2/Cyclin B Activation in Xenopus Egg Extracts via Inhibitory Phosphorylation of Cdc25C Phosphatase by Ca2+/Calmodulin-dependent Protein Kinase II.” An error in the word calmodulin was inserted during formatting of the manuscript.