This is the major myelin protein from the central nervous system. It plays an important role in the formation or maintenance of the multilamellar structure of myelin. May be involved in neuron and glial cell differentiation. Central nervous system. Highest levels in spinal cord and medulla oblongata. First expressed at hatching day, levels rapidly increase during the early postnatal period reaching a maximum by the 9th week. High levels are maintained in adults. Belongs to the myelin proteolipid protein family.