There appear to be two separate pathways that result in the formation of astrocytes. The first pathway suggests that astrocytes are produced by immature cells of the ventricular zone but must temporarily pass via a radial glial cell intermediary. The other pathway proposes that astrocytes are direct descendants of immature cells in the germinal zones and do not pass via a radial cell intermediary stage. The first pathway results in response to epidermal growth factors and is separate from oligodendrocyte lineage. The second pathway shares a common progenitor with oligoden-

Blood vessel

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