00277nam a2200109Ia 4500008004100000040001100041100002100052245003200073260003500105300001700140300001000157251112s9999||||xx |||||||||||||| ||und||  aCNCLSA  aNorton B. Gilula 4aThe Journal of Cell Biology  c1989bpergamon pressaNew York  aP. 6241-6928  bV. 75