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The cellular viability (WST-1 mitochondrial activity assay) of human fibroblast-like synoviocytes (HFLS) incubated with HA-L-PNIPAM 0.5 5%, HA-L-PNIPAM 0.5 5% digested by hyaluronidase, hyaluronic acid 0.71% (2200–2400 kDa), Sulfo DBCO-PEG4-NH2 0.21%, PNIPAM-N3 4.08% (15,000 Da) and Ostenil® after 24 h and 72 h. No statistically significant differences (p > 0.05) with the control (cell culture medium) were observed for all conditions (n = 4; ±sd).
