We are also indebted to Plan Estatal de I+D+I 2013-2016 del Instituto de Salud Carlos III (FEDER co-funding) FIS PI12/00327 to EV, Marató 416/C/2013-2030 and NanoMets to RM, MINECO BIO2013-41019-P, AGAUR (2014SGR-132) and CIBER de Bioingeniería, Biomateriales y Nanomedicina (project NANOPROTHER) to AV for funding our research on protein-based therapeutics.