Tyrosine-protein kinase receptor which, upon binding ligand lin-3, activates 2 signaling cascades: the let-60/Ras and MAP kinase signaling pathway and the let-60-independent phospholipase C-mediated Ca(2+) signaling pathway. Each pathway regulates distinct functions. By activating let-60/Ras, regulates larval development, induction of vulva cell precursors during vulva development, male spicule formation and posterior development of the epidermis (PubMed:2071015, PubMed:8313880, PubMed:9491893, PubMed:20230814, PubMed:32053105). Probably by activating phospholipase plc-3 and inositol 1,4,5-trisphosphate receptor itr-1 signaling cascade downstream of ligand lin-3, plays a role in ovulation by promoting ovulatory gonadal sheath cell contractions (PubMed:9491893, PubMed:15194811). Probably by regulating neuronal transmission in ALA neurons, mediates, independently of let-60/Ras, the decrease in pharyngeal pumping and locomotion during the quiescent state that precedes each larval molt, downstream of lin-3 and upstream of plc-3 (PubMed:17891142). ATP + L-tyrosyl-[protein] = ADP + H(+) + O-phospho-L-tyrosyl-[protein] Basolateral and apical membrane of cell junctions in epithelial vulval precursor cells. Expressed in vulval precursor cells (at protein level) (PubMed:10359617). Expressed in ALA neurons, 2 ventral head neurons, a single neuron in the tail, pharyngeal-intestinal valve and posterior arcade epithelial cells (PubMed:17891142). Expressed during L2 and L3 larval stages (PubMed:10359617). Highly expressed in vulval precursor cells P6.p in late L2 and early L3 stage larvae (PubMed:32053105). Larval lethality, lack of vulva formation, infertility and lack of male spicule formation (PubMed:2071015). RNAi-mediated knockdown causes sterility, a small decrease in the peak rate of sheath cell contractions and a delay in the onset of ovulatory contractions (PubMed:15194811). Restores normal pharyngeal pumping rate in 30 percent of animals overexpressing lin-3 (PubMed:17891142). Belongs to the protein kinase superfamily. Tyr protein kinase family. EGF receptor subfamily.