Figure 2From: From basic research to clinical development of MEK1/2 inhibitors for cancer therapyThe MAP kinase kinases family. (A) MAP kinases and their upstream MAPKKs. (B) Schematic representation of human MAPKKs. MAPKKs are composed of a kinase catalytic domain (in blue) flanked by N- and C-terminus extensions of varying lengths. The percentage of identity of the kinase domain with MEK1 is indicated. An NES, only present in MEK1 and MEK2, is indicated in yellow.Back to article page