Has no detectable kinase activity in vitro and is unlikely to function as a tyrosine kinase in vivo (By similarity). Receptor which may act as a receptor for Wnt ligand mom-2. Plays a role in controlling P7.p vulva precursor cell lineage orientation during vulva development (PubMed:15369677, PubMed:15649465). Regulates pop-1 asymmetric distribution in P7.p and its daughter cells (PubMed:15649465). Plays a role in the migration of ALM neurons during embryogenesis (PubMed:18622031). Localizes to the basolateral cell membrane of vulval precursor cells. Expressed in vulva cell precursors (VPC) P5.p, P6.p and P7.p, and their descendants during L3 and L4 larval stages. Belongs to the protein kinase superfamily. Tyr protein kinase family. May lack kinase activity. The human ortholog has been shown to have impaired catalytic activity with an inability to undergo autophosphorylation or to phosphorylate substrates.