this study analysed the regulatory effects of transforming growth factor beta ( tgf beta ) on the expression of a 70,000 mw cell surface activation antigen , tlisa1 , involved in the differentiation of cytotoxic t lymphocytes ( ctl ) and lymphokine-activated killer ( lak ) cells from their precursor ( s ) , and also examined the role of tgf beta in the generation of these functional cells .
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