Overview of Protein Serine/Threonine Phosphatases.- Protein Phosphatase 1.- Protein Phosphatase 2A: A Multifunctional Regulator of Cell Signaling.- Calcineurin: Roles of the Ca2+/Calmodulin-dependent Protein Phosphatase in Diverse Eukaryotes.- Roles of Mammalian Protein Phosphatase 2C Family Members in the Regulation of Cellular Functions.- PP5: the TPR Phosphatase.- Protein Histidine Phosphatases in Signal Transduction and Metabolism.- Anchoring of Protein Kinase and Phosphatase Signaling Units.- Functional Proteomics in Phosphatase Research.- Structure and Function of the T-cell Protein Tyrosine Phosphatase.- Protein Tyrosine Phosphatase-based Therapeutics: Lessons From PTP1B.- The CD45 Phosphotyrosine Phosphatase.- Receptor Protein Tyrosine Phosphatases.- The Shp-2 Tyrosine Phosphatase.- SHP-1 Twelve Years on: Structure, Ligands, Substrates and Biological Roles.- The Dual-specific Protein Tyrosine Phosphatase Family.- Tyrosine Phosphatases in Cancer: Targets for Therapeutic Intervention.