Fig. 2

a MTT cell proliferation assay on human endometrium stromal cells (HESC) on 200 and 500 ng concentration of recombinant VEGF₁₂₁. Absorbance read at 570 nm; data represented as mean ± S.D. from 3 replicates. Asterisks (***) indicate significant differences of p < 0.001 in comparison with 200 ng vs. 500 ng. b MTT cell proliferation assay on human endometrium stromal cells (HESC) on PLA encapsulated rVEGF₁₂₁. Cells incubated with different concentrations for 24 h and compared with controls. Absorbance read at 570 nm; data represented as mean ± S.D. from 3 replicates. Y-axis showing the proliferation increase; asterisks (***) indicate significant differences of p < 0.001 in comparison with PBS (negative control) vs. day 1, day 20, and day 30