Mutation of the mouse klotho gene leads to a syndrome resembling ageing - Kuro-o, M; Matsumura, Y; Aizawa, H; Kawaguchi, H; Suga, T; Utsugi, T; Ohyama, Y; Kurabayashi, M; Kaname, T; Kume, E; Iwasaki, H; Iida, A; Shiraki-Iida, T; Nishikawa, S; Nagai, R; Nabeshima, Y I (Nature, 1997)