May play a role in maintenance and/or transport of vesicles. Expressed specifically in brain where it is widely expressed, with highest levels of expression in thalamus and hypothalamus. In brain, found in neural cell bodies and detected in many regions of the limbic system, such as the septum nucleus, horizontal and vertical limbs of the diagonal band, hippocampus, amygdaloid nucleus, and habernula nucleus. Also localizes to small vesicles found in the perinuclear region of Neuro2a and PC12 cells. In cerebral cortex first detected at 15.5 dpc with increasing levels of expression observed during postnatal stages. Belongs to the VMP family.