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Mitogen-acitvated protein kinase kinase 6 (MKK6) belongs to the serine/threonine protein kinase family and the MAPK kinase subfamily (MAP2K, MKK or MEKs). MAPKs require dual phosphorylation on threonine and tyrosine residues, an activation step carried out by MAPK kinase (1-2). MKK6, closely related to MKK3, efficiently phosphorylates and activates p38 MAP kinase in response to inflammatory cytokines and environmental stress but not JNK or ERK (3). MTK1 phosphorylates MKK6 on serine 207 and threonine 211 (4).