Cerebellin-2 (CBLN2) is an approximately 25 kDa glycoprotein in the Cerebellin family of C1q- and TNF-related proteins. It contains a potential membrane-associating segment but may also be secreted. It contains one C1q-like domain in its extracellular region. Cerebellin-2 expression is developmentally regulated in the cerebellum, neocortex, sensory neurons of the dorsal root ganglion and spinal cord, and adrenal cortex. It associates with Cerebellin-1 which is involved in the formation and maintenance of synapses in the cerebellum. Within the ectodomain (aa 50-224), Human Cerebellin-2 shares 99% aa sequence identity with mouse and rat Cerebellin-2.