00344nam a2200109Ia 4500008004100000040001100041100002500052245008400077260005000161300001300211300001000224251112s9999||||xx |||||||||||||| ||und||  aCNCLSA  aRobert L. Sinsheimer 0aProceedings of the National Academy Of Sciences of the United States of America  cMay 1, 1991bAmerican Chemical SocietyaU.S.A  aP. 1-432  bV. 67