Possible role in the function of olfactory neurons. ATP + L-seryl-[protein] = ADP + H(+) + O-phospho-L-seryl-[protein] ATP + L-threonyl-[protein] = ADP + H(+) + O-phospho-L-threonyl-[protein] ATP + L-tyrosyl-[protein] = ADP + H(+) + O-phospho-L-tyrosyl-[protein] Expressed in all somatic cells. First observed during early cell morphogenesis in the embryo, levels increase during later embryonic development and remain at comparable levels throughout larval and adult stages. No visible phenotype. Belongs to the protein kinase superfamily. CMGC Ser/Thr protein kinase family. MNB/DYRK subfamily.