Scientific Resources Basic Information Processing Structures that are essential for the understanding of Biological Systems. Scientific Resources Mathematical Methods and Techniques. Scientific Resources index periodicorum Journal Directory and Submission Guide. Diagnostical Methods SPINA, an approach to determine hidden properties of signal transfer systems in vivo.	Featured Books U. Alon (2006). An Introduction to Systems Biology: Design Principles of Biological Circuits D. A. De Jong (2007). Progress in Biological Cybernetics Research     Journal Club Original Article Deng, B. (2006). "Why is the number of DNA bases 4?" Bull Math Biol. 68 (3): 727-33. Epub 2006 Mar 29. Review Fricke, O., G. Lehmkuhl und E. Schoenau (2006). "The principle of regulation in biology--from bone to eating behavior." Exp Clin Endocrinol Diabetes. 114 (4): 197-203.