Effects of FN on the proliferation of EML-C1 cells. EML-C1 cells (3 × 10⁴) were incubated with or without FN in IMDM containing SCF (20 ng/mL) for the indicated times. Cell proliferation was measured using an MTT colormetric assay. The results are shown as mean ± SD of quardricate cultures. Statistically significant differences from control (BSA) values are indicated by two (P < .01) or three (P < .001) asterisks. (▵), Medium; (○), BSA; (□), FN.