Receptor tyrosine kinase required for larval development (PubMed:7585964). May phosphorylate adapter protein soc-1 which in turn may result in the recruitment and/or activation of phosphatase ptp-2 (PubMed:11689700). May activate the Ras/MAPK kinase signaling pathway which includes sem-5, sos-1, let-60/Ras, lin-45/Raf, mek-2 and mpk-1 (PubMed:11689700). Acts in the hypodermis to regulate axon growth and fluid homeostasis (PubMed:12835392, PubMed:7585964). Activates protein degradation in muscles (PubMed:14517244). Probably following interaction with ligand let-756, regulates negatively membrane protrusion from body wall muscles during larval development (PubMed:16495308). Plays a role in nicotinic acetylcholine receptor (nAChR)-mediated sensitivity to nicotine (PubMed:15990870). Regulates synaptic levels of nAChR subunit lev-1 in the nerve cord (PubMed:15990870). Affects the maintenance of axon position without affecting axon growth. Interaction with egl-17 is required for the guidance of sex myoblast migration during gonad development. Interaction with let-756 appears to play a role in maintaining body morphology at higher temperatures. Interaction with let-756 appears to play a role in maintaining body morphology at higher temperatures. Interaction with let-756 appears to play a role in maintaining body morphology at higher temperatures. Interaction with let-756 appears to play a role in maintaining body morphology at higher temperatures. ATP + L-tyrosyl-[protein] = ADP + H(+) + O-phospho-L-tyrosyl-[protein] Activity is regulated by the phosphatase clr-1, however it is not known whether clr-1 acts directly on egl-15. Early arrest in larval development. Impaired guided migration of sex myoblasts (PubMed:7585964). RNAi-mediated knockdown causes ectopic membrane extension from body wall muscles (PubMed:16495308). Belongs to the protein kinase superfamily. Tyr protein kinase family. Fibroblast growth factor receptor subfamily.