00253nam a2200097Ia 4500008004100000082001400041100003600055245002400091260003200115300000800147140113s9999    xx            000 0 und d  a576.3  L5  a"De Robertis, E.D.P., et al�"  aCell biology -edn.6  a1976bW.B. saunderscLondon  a615