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HUVEC viability after 2 h (a) or 24 h (b) of incubation with free CE (2, 5, 10 µg/mL GAE) and CE-loaded NP1 or NP2 (CE concentration, 2 µg/mL GAE) in culture medium. Data are expressed as % viable cells compared to 100% of control (untreated cells). *, significantly different from control; **, significantly different from each other.
