Tyrosine-protein kinase receptor that functions during early stages of neuronal development. ATP + L-tyrosyl-[protein] = ADP + H(+) + O-phospho-L-tyrosyl-[protein] Expressed in neural cell lineage from embryonic stage 11 onwards, resulting in expression in the brain and ventral nerve cord at the end of embryogenesis. Expressed at high levels in embryos and larvae, low levels in adults and pupae show maximal expression. Belongs to the protein kinase superfamily. Tyr protein kinase family. ROR subfamily.