00360nam a2200109Ia 4500008004100000040001100041100002500052245008400077260006200161300001700223300001000240251112s9999||||xx |||||||||||||| ||und||  aCNCLSA  aRobert L. Sinsheimer 0aProceedings of the National Academy Of Sciences of the United States of America  cApril, 1978bThe National Academy of SciencesaWashington  aP. 1609-3010  bV. 75