ERK8 is an alias for the gene, Mitogen-activated protein kinase 15, in humans. Other names include: MAP kinase 15; MAPK 15; Extracellular signal-regulated kinase 7; ERK-7; Extracellular signal-regulated kinase 8; ERK-8; extracellular signal regulated kinase 8; ERK7. The encoded protein is an enzyme with an amino acid length of 544 and a mass of 59.8 kDa. Other isoforms may exist. ERK8 is a member of the Protein kinase superfamily, CMGC Ser/Thr protein kinase family, MAP kinase subfamily. This gene shares homology with other species, including: Fly, Rat, Zebrafish.