participates in MAPK cascade obsolete activation of MAPK activity signal transduction negative regulation of cell population proliferation positive regulation of gene expression negative regulation of gene expression peptidyl-tyrosine phosphorylation regulation of stress-activated MAPK cascade positive regulation of ERK1 and ERK2 cascade positive regulation of protein serine/threonine kinase activity regulation of early endosome to late endosome transport protein dual specificity mitogen-activated protein kinase kinase 1 Homo sapiens protein dual specificity mitogen-activated protein kinase kinase 1 (human) MEK1 A dual specificity mitogen-activated protein kinase kinase 1 that is encoded in the genome of human. PR:Q02750 protein MAPKK 1 (human) MAP2K1 MKK1 (human) hMAP2K1 MAP kinase kinase 1 (human) MAPK/ERK kinase 1 (human) UniProtKB:Q02750 MEK 1 (human) DTO:03100334 Category=organism-gene. PRKMK1 ERK activator kinase 1 (human)