00319nam a2200109Ia 4500008004100000040001100041100002500052245008400077260002200161300001700183300000900200251112s9999||||xx |||||||||||||| ||und||  aCNCLSA  aRobert L. Sinsheimer 0aProceedings of the National Academy Of Sciences of the United States of America  cJuly, 1978aU.S.A  aP. 3011-4632  bV.57