Receptor tyrosine kinase which may be involved, downstream of pvf-1, in the positioning of ray 1, the most anterior ray sensillum in the male tail. ATP + L-tyrosyl-[protein] = ADP + H(+) + O-phospho-L-tyrosyl-[protein] Expressed in the ALA neuron. Belongs to the protein kinase superfamily. Tyr protein kinase family.