Involved in negative regulation of receptor clustering. Located in presynaptic active zone. Expressed in GABAergic neurons; cholinergic neurons; nervous system; and ventral cord neurons. Used to study autism spectrum disorder. Human ortholog(s) of this gene implicated in Pitt-Hopkins-like syndrome 2. Is an ortholog of human NRXN1 (neurexin 1) and NRXN3 (neurexin 3).