Figure 1: Constitutive phosphorylated of FLT3 in SEM cells is detected by PathScan ® Phospho-FLT3 (panTyr) Sandwich ELISA kit #7761. In contrast, only a low level of phospho-FLT3 protein is detected in SEM cells treated with CT-53518, an inhibitor of FLT3 tyrosine phosphorylation. The inhibitor does not affect the level of total FLT3 protein detected by PathScan ® Total FLT3 Sandwich ELISA kit #7202. Absorbance at 450 nm is shown in the top figure, while the corresponding western blots using Phospho-FLT3 (Tyr591) Antibody #3461 (right panel) or FLT3 Rabbit mAb #3462 (left panel), is shown in the bottom figure.