EC 2.7.11.1, MST-1, Mammalian STE20-like protein kinase 1, STE20-like kinase MST1, STK4, Serine/threonine protein kinase 4, Serine/threonine protein kinase Krs-2, kinase MST1, serine/threonine kinase 4; STE20-like kinase MST1; Yeast Sps1/Ste20-related kinase 3