Ready-to-use ELISA kits are available for the detection of Mitogen Activated Protein Kinase Kinase 1, an alias of the protein, mitogen-activated protein kinase kinase 1. The official gene symbol is MAP2K1. The protein, with a mass of 43.4 kDa and length of 393 residues, is reported to be cytoplasmic and nuclear. It is a member of the Protein kinase superfamily, STE Ser/Thr protein kinase family, MAP kinase kinase subfamily and may be known by other names, including: CFC3, protein kinase mitogen-activated kinase 1 (MAP kinase kinase 1), MAPKK 1, MAPK/ERK kinase 1, ERK activator kinase 1, and MEK1.