Highly expressed in brain and testis. Expressed in the hippocampus, olfactory bulb, and cerebellum. Low expression detected in lung, heart, liver, skin, colon and kidney. At 11 dpc expressed throughout the entire neuroepithelium. In the developing brain, expressed in the forebrain, tectum, cerebellum, striatum and olfactory bulb. At 15.5 dpc expressed in the cortex; the dorsal part of the telencephalon becomes laminated, and expression is observed in the upper and ventricular layers. At 18.5 dpc expression in the ventricular zone is weak. Expression is down-regulated in Reln-null embryos. Expression in P19 cell line was up-regulated by treatment with Reln. Belongs to the SBNO family. Contaminating sequence. Potential poly-A sequence.