Tubulin polymerization assays were conducted using the HTS-Tubulin polymerization assay kit (Cytoskeleton Inc.) as described previously.10 The final concentration of test compounds was 50 μM in 0.5% DMSO. Tubulin polymerization kinetics were measured at 37 °C in a Tecan microplate reader (Tecan Group Ltd.) at 340 nm every minute for 1 h.
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