00334nam a2200097Ia 4500008004100000040001100041245008400052260007600136300001400212300001000226251112s9999||||xx |||||||||||||| ||und||  aCNCLSA 0aProceedings of the National Academy Of Sciences of the United States of America  cJanuary 2, 1991bAmerican Association for Cancer ResearchaPhiladelphia  aP. 1-1058  bV. 47