May have a role in synaptic regulation or signal transduction. Nervous system tissue. Found in the electric lobe, the brain and the spinal cord. Three isoforms are detected: 17.5 kDa, 18.5 kDa and 20.0 kDa. In the neuronal cell soma, the 17.5 kDa species is predominant. Belongs to the synuclein family.