Highly selective, reversible and cell permeable MEK (MAP kinase kinase) inhibitor. Blocks the phosphorylation and activation of the MAP kinase pathway. T cell activation inhibitor. Inhibits cell growth and cell proliferation of several cancer cells.Storage and Stability:Short-term Storage: +4°CLong-term Storage: -20°CStable for at least 2 years after receipt when stored at -20°C. Store solutions at -20°C in the dark.