00385nam a2200121Ia 4500008004100000022001400041040001100055100002700066245008400093260006100177300001600238300000900254251112s9999||||xx |||||||||||||| ||und||  a0027-8424  aCNCLSA  aNicholas R. Cozzarelli 0aProceedings Of The National Academy Of Sciences Of The United States Of America  cFebruary 16,1999bThe National Academy Of ScienceaU.S.A  aP.1163-2570  bV.96