How an epidermal growth factor (EGF)-like domain binds calcium. High resolution nmr structure of the calcium form of the NH2-ter-minal EGF-like domain in coagulation factor X - Selander-Sunnerhagen, M; Ullner, M; Persson, E; Teleman, O; Stenflo, J; Drakenberg, T (J Biol Chem, 1992)