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Intracellular uptake of fluorescein-loaded TFs in nonactivated and TAM- or TAF-activated B16F10 melanoma cells (A). Mechanism of endocytic uptake of TFs in nonactivated (B), TAM-activated (C), and TAF-activated (D) B16F10 melanoma cells. ns, not significant. *p<0.05; **p<0.01; **p<0.001; ****p<0.0001.
