00349nam a2200109Ia 4500008004100000022001400041040001100055100002700066245008300093260005400176300000900230251112s9999||||xx |||||||||||||| ||und||  a0027-8424  aCNCLSA  aNicholas R. Cozzarelli 0aProceedings Of The National Academy Of Science Of The United States Of America  c1997bThe National Academy Of ScienceaWashington  bV.93