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Figure 5: Activation of PDFGβR in serum-starved sarcoid-derived cell lines (EqS). The PDFGβR immunoprecipitated in serum-deprived cells is phosphorylated only in EqS02aE5 and EqS04b, which express the higher levels of BPV-1 E5 among the analyzed cell lines (I.P.: immunoprecipitation; I.B.: immunoblotting).