Figure 1.

The proliferation of undifferentiated and differentiated SH-SY5Y cells. Cells were differentiated in 10 μM retinoic acid (RA). After differentiation for 2, 4, and 6 days, cell proliferation was assessed using MTT assay. Absorbance at 570 nm with 665 nm as a reference was measured, and differences between the two absorbances were analyzed. Data are expressed as mean ± SD from three replicate wells. ^∗ P < 0.05.