lev-10 encodes a CUB and LDLa domain-containing type I transmembrane protein; LEV-10 activity is required cell autonomously in muscle cells for clustering of post-synaptic UNC-29-containing ionotropic acetylcholine receptors (AChR); when expressed in body wall muscles, LEV-10 localizes to cholinergic neuromuscular junctions; the LEV-10 extracellular region is sufficient for rescue of AChR clustering.