MeSH definition : Mitogen-activated protein kinase kinase kinases (MAPKKKs) are serine-threonine protein
kinases that initiate protein kinase signaling cascades. They phosphorylate MITOGEN-ACTIVATED
PROTEIN KINASE KINASES; (MAPKKs) which in turn phosphorylate MITOGEN-ACTIVATED PROTEIN
KINASES; (MAPKs).;
Mitogen-activated protein kinase kinase kinases (MAPKKKs) are serine-threonine protein
kinases that initiate protein kinase signaling cascades. They phosphorylate MITOGEN-ACTIVATED
PROTEIN KINASE KINASES; (MAPKKs) which in turn phosphorylate MITOGEN-ACTIVATED PROTEIN
KINASES; (MAPKs).