**4. Conclusion**

Ferritin is a well-known molecule with enormous potentiality in biotechnology. It has been already used to encapsulate molecules, as contrast in MRI and to carry epitopes. This chapter offers an original strategy to design a new bifunctional hybrid protein, which can be proposed as a stable iron regulatory molecule or a drug-delivery agent. The results could be exploited by scientists to produce ferritin subunits carrying other functionalities or epitopes, in order to have multifunctional complexes. It can be a new platform with utmost importance in the field of cell and gene therapies.
