Genetic regulatory networks are devoted to the control of important functions like cell energy, organ morphogenesis, and animal immune defense. Since the innate system of defense represented by the Toll-like receptors (TLRs, already present in insects), mammals have developed an adaptive immune system during the embryonic maturation of their T-cell receptors (TCRs) α and β (TCRα and TCRβ) from strategies of DNA rearrangements essentially under the control of the RAG gene. This chapter will describe the immunologic networks (“immunetworks”) in charge of controlling the concentration of both TLRs and TCRs and show that circuits in the core of their interaction graph are responsible for a few number of dedicated attractors, responsible of the dynamics of receptor synthesis. In the same spirit, we describe a network important for the cell oxidative metabolism: the ferritin (iron-storage protein) control network regulating iron metabolism in mammals and eventually, study an engrailed and biliary atresia morphogenetic network.