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In vitro cytotoxicity studies of PGNP1D and relative unloaded formulations at different dilutions on the human nasal cell line RPMI 2650. The cell viability is recorded as percentage cell viability in comparison with non-treated control cells (100% viability). Results are represented as mean ± SD from three independent experiments. The asterisks indicate statistically significant data (* = p ≤ 0.05), ns indicates not significant data (p > 0.05).
