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The deal of ProBio3 project is to develop the microbial conversion on specific fatty acids of carbon substrates from renewable resources and industrial by-products. The main application fields are BiojetFuels and green chemistry. The objectives focus on the identification of renewable feedstock suitable for microbial nutritional requirements, the development of an intensive bioprocess, the proof of feasibility at pilot scale (m3) with the evaluation of environmental, economic and societal impacts. During 8 years, 16 French partners (9 research units LISBP, MICALIS, IJPB, IGM, IMFT, SQPOV, TSE, TWB, IFPen, 4 industries Airbus, EADS, Sofiproteol, Tereos et 3 technical centres ITERG, CVG, CREOL) associate their interdisciplinary competences from Life Sciences to Process Engineering including Economic and Social Sciences. With Investissement d’Avenir financial support, the expected impacts are increases of fundamental knowledge of lipid metabolism in oleaginous microorganisms, development of high-throughput tools to fasten industrial engineering strains and fermentation strategies, new extraction processes involving green solvents and realistic scale up studies towards an industrial pilot; with undeniable innovative aspects, the deal is to get competitive assets for leading international positions on a new biological route.