Fig. 4. Differential effects of 29 kDa and 42 kDa Fn fragments of Fn assembly. Incorporation of [¹²⁵I]Fn into the deoxycholate-insoluble fraction by Swiss 3T3 vector (A) or tTG[2] (B) transfectants was analyzed in the presence of indicated concentrations of the unlabeled 29 kDa fragment (), 42 kDa fragment () or a combination of the two Fn fragments ([UNK]). Data is presented as a percentage of [¹²⁵I]Fn incorporated in the absence of the unlabeled Fn fragments for each of the two cell lines. The results are representative of three independent experiments (mean±s.e.m.).