Fig. 2. Neurite outgrowth from monolayer cells and spheroids cultured without (-) and with (+) 10 μM RA. After 2 days of cell growth, cells were treated with RA, and neuritogenesis was observed 3 and 6 days after RA treatment. Spheroids were formed using 1 μM RGD-ELP. Magnification is ×200. Scale bar is 50 μm.