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Effect of ultrasound on viability of MC3T3-E1 cells cultured in complete medium (CM), serum-starved medium (SS), or serum-starved medium containing chitosan nanoparticles (SS + CNP) 24 h after CNP delivery and US stimulation. All values were expressed as mean ± SE, **p < 0.01, ***p < 0.001 (n = 3).
