Fig. 3

Effect of different scaffolds on Raw264.7 cells proliferation. A-C Cell proliferation via MTT assay in macrophages. Cell proliferation was evaluated by MTT assay at 1 day and 3 days. B-D Live and dead cells were assessed by a confocal laser scanning microscopy after labeling macrophages with fluorescein diacetate (FDA, green) and propidium iodide (PI, red). Green indicated living cells and dead cells were labeled as red fluorescence. Group a = control, group b = PLA scaffold, group c = PLA-Exo scaffold