The function of Ensembl gene identifier ENSG00000073803 (MAP3K13, mitogen-activated protein kinase kinase kinase 13) is as follows. Activates the JUN N-terminal pathway through activation of the MAP kinase kinase MAP2K7. Acts synergistically with PRDX3 to regulate the activation of NF-kappa-B in the cytosol. This activation is kinase-dependent and involves activating the IKK complex, the IKBKB- containing complex that phosphorylates inhibitors of NF-kappa-B. {ECO:0000269|PubMed:11726277, ECO:0000269|PubMed:12492477, ECO:0000269|PubMed:9353328}.