the yf subunit , an enzyme found in human tumors and in placenta ( polidoro , g. , di mio , c. , del boccio , g. , zulli , p. , and fererici , g. ( 1980 ) biochem . pharmacol . 29 , 1677-1680 ) has also been shown to be elevated in hepatic preneoplastic lesions ( kitahara , a. , satoh , k. , nishimura , k. , ishikawa , t. , ruike , k. , sato , k. , tsuda , h. , and ito , n. ( 1984 ) cancer res . 44 , 2698-2703 ) .
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