**Protein-Noble Gas Interactions Investigated by Crystallography on Three Enzymes - Implication on Anesthesia and Neuroprotection Mechanisms**

Nathalie Colloc'h1, Guillaume Marassio1 and Thierry Prangé2 *1CI-NAPS UMR 6232 Université de Caen Basse-Normandie – CNRS, Centre Cyceron, Caen, 2LCRB, UMR 8015 – CNRS – Université Paris Descartes, Faculté de Pharmacie, Paris, France* 
