Calcium-Binding Proteins, Cell Cycle Proteins, Crystallization, Crystallography, X-Ray, GTPase-Activating Proteins, Microfilament Proteins, Protein Structure, Tertiary, Recombinant Fusion Proteins, Schizosaccharomyces, Schizosaccharomyces pombe Proteins, Static Electricity, Synchrotrons, Thrombin