Biographies and pictures Eric Voltà Durán graduated in Biotechnology in 2018 and developed his Master Thesis in Advanced Nanoscience and Nanotechnology at the Nanobiotechnology group led by Prof. Villaverde at the Autonomous University of Barcelona. He is currently starting a PhD in Biotechnology in the same group, working on the design and production of proteins with biomedical interest. He is currently focused on the rational engineering of CXCR4-targeted protein nanoparticles, with great potential in cancer therapy. Esther Vázquez is Senior Researcher at the Institut de Biotecnologia i de Biomedicina, Universitat Autònoma de Barcelona, Spain, and Associate Professor at the Department de Genètica i de Microbiologia, of the same university. She is also member of the CIBER of Bioengineering, Biomaterials and Nanomedicine. Being formed at the State University of New York. USA, and after working in different Universities on molecular medicine, she is now interested on protein drug design, recombinant protein production, nanobiotechnology and protein nanoparticles for targeted therapies. Antonio Villaverde graduated in Biological Sciences in 1982 and got his PhD in 1985. He has been scientifically formed in Barcelona, Madrid, London, Lausanne and Braunschweig. Since 1987, he is Professor of Microbiology at the Universitat Autònoma de Barcelona, Spain, were he got a Full Professorship in 2002. He leads the Nanobiotechnology group in this university and in the CIBER-BBN, focusing to the design of protein-based materials for biomedical applications. He founded the journal Microbial Cell Factories in 2002, being its Editor-in-Chief for 15 years.