Involved in the recognition and selection of protein complexes to exit the endoplasmic reticulum (ER) (PubMed:19609303). In muscles, regulates levamisole-sensitive nicotinic acetylcholine receptor (L-AChR) subunit composition, possibly by allowing only specific L-AChR subunit combinations to exit the ER (PubMed:19609303). Specifically, may promote the inclusion of alpha subunit unc-38 into and the exclusion of unc-29 from L-AChR (PubMed:19609303). Regulates L-AChR sensitivity to agonists such as nicotine and levamisole at neuro-muscular junctions (PubMed:19609303). May interact with nra-2 in the ER. Expressed in body wall, pharyngeal, uterine and vulval muscles, motor neurons, nerve ring, motor and ventral cord neurons, hypodermal cells in the tail, vulval epithelium and intestine. Expressed in embryos and adults.