[1] Univ Strasbourg, ESBS, UMR7175, Illkirch Graffenstaden, France
[2] Univ Strasbourg, Fac Pharm, Illkirch Graffenstaden, France
[3] Univ Zurich, Div Clin Chem & Biochem, Dept Pediat, Zurich, Switzerland
[4] Max Planck Inst Biophys Chem, NMR Based Struct Biol, D-37077 Gottingen, Germany