MAP Kinase 2, Active, Recombinant, Mouse (Mitogen-activated Protein Kinase 2, MAPK 2, MAPK2, Extracellular Signal-regulated Kinase 2, ERK2, ERK-2, ERK, ERT1, MAP Kinase Isoform p42, Mitogen-activated Protein Kinase 1, MAP Kinase 1, MAPK 1, Mapk1, Mapk, p42mapk, p42-MAPK, Prkm1, PRKM2)