Probable serine/threonine-protein kinase; maternally required for correct patterning in the posterior part of each embryonic metamere. May be involved in control of cell division during metamorphosis and ovarian development. May interact with costal-2. ATP + L-seryl-[protein] = ADP + H(+) + O-phospho-L-seryl-[protein] ATP + L-threonyl-[protein] = ADP + H(+) + O-phospho-L-threonyl-[protein] Expressed in all imaginal disks, higher level in wing disk. Expressed both maternally and zygotically, low expression is present in males, larvae and pupae. Belongs to the protein kinase superfamily. Ser/Thr protein kinase family.