Protein kinase involved in the transduction of mitogenic signals from the cell membrane to the nucleus (Probable). Phosphorylates MAP2K1, and thereby activates the MAP kinase signal transduction pathway (PubMed:21441910, PubMed:29433126). Phosphorylates PFKFB2 (PubMed:36402789). May play a role in the postsynaptic responses of hippocampal neurons (PubMed:1508179). {ECO:0000269|PubMed:1508179, ECO:0000269|PubMed:21441910, ECO:0000269|PubMed:29433126, ECO:0000269|PubMed:36402789, ECO:0000305}. This is the function of BRAF (B-Raf proto-oncogene, serine/threonine kinase, ENSG00000157764).