00359nam a2200109Ia 4500008004100000040001100041100002500052245008400077260006400161300001400225300001000239251112s9999||||xx |||||||||||||| ||und||  aCNCLSA  aRobert L. Sinsheimer 0aProceedings of the National Academy Of Sciences of the United States of America  cJanuary, 1976bThe National Academy of SciencesaWashington  aP. 1-1374  bV. 73