by testing all extracts on all cell lines we found that ( 1 ) production of and susceptibility to the inhibitors were decreased in transformed balb/c cells ( 2 ) specificity varied with expression of the transforming genome , as an extract from a given cell line inhibited the growth of its cell of origin , e.g . revertant , more than normal or transformed cells , and ( 3 ) there was also a dna-synthesis stimulator .
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growth of
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