Putative role in axonal outgrowth and guidance, required for the navigation of identified commissural neurons. Could be a receptor the midline morphogen. Expressed by a subset of neuroblasts, ganglion mother cells and neurons of the CNS; by all sensory neurons of the PNS. N-glycosylated. Contains disulfide bonds. Named after the main character of a 16th century Spanish novel, Lazarillo de Tormes, a crafty boy who guided a blind man. Belongs to the calycin superfamily. Lipocalin family.