MITOGEN-ACTIVATED PROTEIN KINASE KINASE KINASE KINASE 1 (EC 2.7.1.37) (MAPK/ERK KINASE KINASE KINASE 1) (MEK KINASE KINASE 1) (MEKKK 1) (HEMATOPOIETIC PROGENITOR KINASE). [Source:SWISSPROT;Acc:Q92918]