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[The DM-20 proteolipid is a major protein of the brain. It is synthetized in the fetus earlier than the major myelin proteolipid (PLP)].

By studying highly purified CNS proteolipids, we have shown that DM-20 proteolipid, which was considered, until now, to be a minor brain proteolipid is, in fact, almost as abundant as the Major Myelin Proteolipid known also as Proteolipid Protein (PLP). DM-20 proteolipid is even the major brain proteolipid in young foetuses. It is only during myelinisation that the "Proteolipid Protein" increases rapidly and becomes equivalent in weight to DM-20 proteolipid. This study raises the question of the particular function of DM-20 proteolipid.