Bio-Xtal is historically a provider of structural biology services. Since twelve years, our know-how in structural biology allowed us to perform projects ranging from domain definition to the structure resolution of protein/ligand or protein/protein interactions by Xray crystallography and NMR. We put an emphasis on monitoring the activity of our targets to ensure the relevance of the structural data we deliver. Our policy is to systematically develop home designed activity assays during our structural biology projects. Mastering eukaryotic and prokaryotic expression systems allows us to supply high quality protein for the needs of your compound screening as well as for structural studies of the selected compound’s complexes, guarantying the coherence of the results obtained on both sides A new key service from of Bio-Xtal is the cytosoluble single chain antibody fragment selection (Cytobody™). These can be raised against any antigen within a very short delay (4 weeks) and are very well expressed in either mammalian or bacteria cells. This allows their expression in Coli for large scale production and expression within mammalian cells for cellular biology applications. The applications of the Cytobodies ranges from the discovery of new druggable sites in multi-domain proteins to immuno-detection, cell imaging, protein purification, and protein stabilisation.