This book presents a summary of the application and instrumentation of cell electrophoresis. The method of making cell purification and characterization possible according to the cellular negative surface charge density is discussed, and ideas for future developments are explained. The negative electrostatic forces at cell surfaces provide information about cell-cell interaction, blood vessel sealing, cytokine actions, cell transformation, ion transport phenomena, and other biological phenomena. Recalculations of the physical principles of cell electrophoresis reveal possibilities for removing disruptive factors caused by electrical current, heat, and sedimentation. The introduction of computer technology, the performance of simultaneous two-parameter measurements, and the application of cell-friendly but current-inert buffer systems render the method more reliable and efficient.Theoretical Considerations: Contributions to a Mathematical Theory of Free Flow Electrophoresis, F.G. Boese Numerical Description of Zone Electrophoresis in the CFE Device, T.M. Grateful, A.M. Athalye, and E.N. Lightfoot Improvements of the Method: Theoretical and Experimental Studies on the Stabilization of Hydrodynamic Flow in Free-Fluid Electrophoresis, P.H. Rhodes and R.S. Snyder The Loading and Unloading of Cells in Electrophoretic Separations, P. Todd Electrode Compartment Separating Membranes for Cell Electrophoresis, J. Heinrich and H. Wagner Cell Electrophoresis Using Antibodies and Antigens as Ligands, H.H.P. Cohly and S.K. Das Buffers and Their Effects on Cells: New Buffer Systems for Cell Electrophoresis, K.A. Kinsley and L.S. Rodkey Alteration of Cellular Features after Exposure to Low Ionic Strength Medium, I. Bernhardt Electrophoresis of Cells at Physiologic Ionic Strength, M.V. Golovanov The Importance of Determination of the Negative Surface Charge Density of Cells: Simultaneous Two-Parameter Measl“.