00290nam a2200109Ia 4500008004100000040001100041100002500052245003900077260003800116300001600154300001000170251112s9999||||xx |||||||||||||| ||und||  aCNCLSA  aFritiof S. Sjostrand 0aJournal of Ultrastructure Research  cOctober, 1989bElsevieraNew York  aP. 669-1280  bV. 25