Potential calcium-dependent cell-adhesion protein that controls axon guidance in the ventral cord. In larvae and adult, it is expressed in various tissues including pharyngeal muscle, hypodermis and gonad. In the nervous system it is expressed in sensory neurons and motor neurons in the ventral cord. Broadly expressed in the nervous system starting early in development (PubMed:22442082). At the L3 larval stage, broad expression throughout the nervous system ceases, and it is specifically expressed in ventral D-type GABAergic motorneurons (PubMed:22442082). Three calcium ions are usually bound at the interface of each cadherin domain and rigidify the connections, imparting a strong curvature to the full-length ectodomain. RNAi-mediated knockdown results in irregular accumulation of snb-1-positive synaptic vesicles along the axons of ventral D-type GABAergic motorneurons.