Fig. 4

Metabolic activity of HPLF. Cell viability was measured after 1, 3 and 6 days incubation on tissue culture polystyrene (TCPS), collagen (2 mg/ml), P11–4 (20 mg/ml) using a metabolic activity assay. Data were calculated to % TCPS control at day 1, n = 3, * p-value ≤0.05, *** p-value ≤0.001, **** p-value ≤0.001. HPLF cultured on P11–4 showed a significant increase in metabolic activity, compared to cells grown on collagen gels