BAG regrouping small crystallographic teams at Lille, Orléans, Roscoff, Nancy and Marseille. For all projects both SAXS and MX-crystallography studies are required to cover different aspects and scales of these often multimodular proteins. The projects in Lille concern Type V secretion systems, Sars-Cov proteins, regulatory networks of signal transduction, starch metabolism (synthesis) and structural glycobiology. In Roscoff the projects concern marine glycobiology and marine phage proteins, deciphering functions of 'unknown' proteins and PUL assemblages. The projects treated in Orléans are DNA structure and repair, transcription regulation, molecular mechanisms of oxidative stress; in Nancy the studies concern the regulation and mechanisms of prokaryotic polyketide syntheses. The subjects of Marseille are SAXS studies of ordered and disordered proteins involved in regulation of CO2 assimilation in microalgae.