FN1 and cystic fibrosis: Fibronectin expression was clearly extracellular, and its synthesis and deposition increased after EV-CM administration to CF-P (1118.96 ± 118.5 versus 2349.31 ± 261.0 mean fluorescence intensity in control CF-P and in CF-P cultured with EV-CM, respectively; p = 0.005).