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a, b) Cell viability of rBMSC and MC3T3-E1 mediated by PEI-, PGEA- and HA-SS-PGEA-containing NPs (*p < 0.05; n = 3 per group). The nitrogen concentration of polycation in medium was 2.6 mg/L. c) CLSM images of rBMSCs mediated by various miRNA-containing NPs. Live and dead cells were stained in green and red, respectively. Scale bar = 50 μm.
