00343nam a2200109Ia 4500008004100000040001100041100002300052245008800075260004300163300001600206300001100222251112s9999||||xx |||||||||||||| ||und||  aCNCLSA  aMichael B. Shimkin 0aCancer ResearchbThe official Organ of the American Association for Cancer Research  cAugust, 1992bpergamon pressaNew York  aP. 619-1313  bV. 31A