x1 = M x2 = MpY x3 = MpT x4 = Mpp x5 = MAPKK x6 = MKP x7 = MpY_MAPKK x8 = MpT_MAPKK x9 = M_MAPKK_Y x10 = M_MAPKK_T x11 = Mpp_MKP_Y x12 = Mpp_MKP_T x13 = MpY_MKP_Y x14 = MpY_MKP_T x15 = MpT_MKP_Y x16 = MpT_MKP_T x17 = M_MKP_T x18 = M_MKP_Y