00323nam a2200109Ia 4500008004100000040001100041100002500052245005100077260006000128300001600188300000900204251112s9999||||xx |||||||||||||| ||und||  aCNCLSA  aRobert L. Sinsheimer 0aProceeding of the national academy of sciences  cJuly, 1977bThe National Academy Of ScienceaWashington  aP.2595-4110  bV.74