Definition: An abundant 43-kDa mitogen-activated protein kinase kinase subtype with specificity for MITOGEN-ACTIVATED PROTEIN KINASE 1 and MITOGEN-ACTIVATED PROTEIN KINASE 3.
Other names Mitogen Activated Protein Kinase Kinase 1; MKK 1 Protein Kinase; MEK 1 Protein Kinase; Mitogen-Activated Protein Kinase Kinase 1; MKK1 Protein Kinase; MKK-1 Protein Kinase; MEK1 Protein Kinase; MEK-1 Protein Kinase; MAPK Kinase 1; MAP2K1 Protein