Synonyms : JN Kinase Kinase, JNK Kinase, JNK-Activating Protein Kinase, JNKK1 Protein Kinase, Jun Amino-Terminal Kinase Kinase, MEK4 Protein Kinase, Mitogen-Activated Protein Kinase Kinase 4, SAP Kinase Kinase 1, SAP Kinase-Extracellular Signal-Regulated Kinase Kinase 1