Effect of gels on human dermal fibroblasts: (a) cell viability and (b) cell proliferation. Cells were exposed to gels (PEG SG-solid gel with PEG, LDI, DOPA, Ag, and peroxydiphosphate; PEG LG-liquid gel with PEG, LDI, and DOPA; LAC SG-solid gel with lactose, LDI, DOPA, Ag, and peroxydiphosphate; LAC LG-liquid gel with lactose, LDI, and DOPA) after 48 h in serum-depleted media. Cell viability and proliferation were assessed at 24, 48 and 72 h. Values are expressed as mean ±SEM (n = 3). NS = not significant, *p<0.05, **p<0.001 compared to diluent alone (No tx-No treatment).