Involved in regulation of presynapse assembly and synaptic membrane adhesion. Located in GABA-ergic synapse; cell surface; and glutamatergic synapse. Is expressed in several structures, including central nervous system; liver; primary head vein; reproductive system; and sensory organ. Orthologous to human LRFN4 (leucine rich repeat and fibronectin type III domain containing 4). [provided by Alliance of Genome Resources, Apr 2022]