retinoic acid ( ra ) can induce the differentiation of teratocarcinoma cells in culture ( s. strickland and v. mahdavi , 1978 , cell 15 , 393-403 ; e. m. v. jones-villeneuve , m. w. mcburney , k. a. rogers , and v. i. kalnins , 1982 , j. cell . biol . 94 , 253-262 ) .
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the differentiation
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cell