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Effect on hMSCs proliferation of HA/CS NPs made of HA with Mw of 280 kDa (yellow bar), 540 kDa (green bar) and 820 kDa (blue bar) after an incubation time of (a) 4 h and (b) 24 h. CTRL (grey bar) represents untreated cells. Results are expressed as percentage of proliferating cells (BrdU positive nuclei) compared to the total viable cells.
