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Proliferation of MC3T3-E1 cells on PCL/PLLA scaffolds according to various mechanical stimuli determined using CCK-8 assays. Results are presented as average ± standard deviation (n = 3). U, ultrasound; U+C, combined stimulation; C, cyclic strain; CN, control. Double asterisks (**) represent statistically significant differences at P < 0.01.
