Description: This O1 monoclonal antibody reacts with galactocerebroside and other lipids found on late oligodendrocyte precursors. O1 has been reported to react to all species tested (rat, mouse, human, chicken). Oligodendrocytes function as myelin-producing cells within the central nervous system ensheathing the axons of neurons with myelin in order to facilitate rapid axonal conduction. O1 and O4 monoclonal antibodies serve as stage-specific markers of oligodendrocyte development with O4 marking early oligodendrocyte progenitors and O1-labeling late oligodendrocyte progenitors. O4-positive cells differentiate to become O1-positive, which can in turn become mature oligodendrocytes.