Supplier Page from United States Biological for MEK1 (K97R), Recombinant, Human (MAPK/ERK Kinase 1, MEK 1, Dual Specificity Mitogen-Activated Protein Kinase Kinase 1, MAP Kinase Kinase 1, MAP2K1, MAPKK 1, MKK1, PRKMK1, ERK Activator Kinase 1)