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LEVEL 1: The SEPTAL EXTREME in a P40 rat exposed to radioactive thymidine on the same days as the P10 and the P20 rat. Unlabeled cells predominate--but only in the external limb.  There are many more labeled granule cells than in the P20 rat.  The extra survival days have allowed labeled precursor cells to differentiate into labeled mature granule cells and migrate into the deep parts of the layer--even in deep parts of the external limb.