00355nam a2200109Ia 4500008004100000040001100041100002700052245008400079260005800163300001300221300001100234251112s9999||||xx |||||||||||||| ||und||  aCNCLSA  aNicholas R. Cozzarelli 0aProceedings of the National Academy Of Sciences of the United States of America  cJanuary 2, 1981bNational Institutes of HealthaU.S.A  aP. 1-266  bV. 211