genes that can inhibit the expression of the tumorigenic phenotype have been detected by the fusion of normal and malignant cells , the phenotypic reversion of in vitro transformants , the induction of terminal differentiation of malignant cell lineages , the loss of 'recessive cancer genes ' , the discovery of regulatory sequences in the immediate vicinity of certain oncogenes , and the inhibition of tumour growth by normal cell products .
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the
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normal cell