00320nam a2200109Ia 4500008004100000040001100041100002500052245008400077260002500161300001400186300001000200251112s9999||||xx |||||||||||||| ||und||  aCNCLSA  aRobert L. Sinsheimer 0aProceedings of the National Academy Of Sciences of the United States of America  cJanuary, 1978aU.S.A  aP. 1-1608  bV. 75