Figure 1: (1a): A photomicrograph of a section in the cerebellar cortex of a rat from control group showing scattered small stellate (Sc) and basket cells (B) in the molecular layer. Large pyriform cells with vesicular nuclei (P) are shown in the Purkinje cell layer. Crowded small cells with deeply stained nuclei (G) are shown in the granular layer [H&E x 400]. (1b): A photomicrograph of a section in the cerebellum of a rat from group II showing decreased density of neurons in the three cortical layers. Purkinje cells (P) are widely displaced and distorted. Granule cells (G) appear less crowded than in the control group [H&E x 400]; (1c): A photomicrograph of a section in the cerebellum of a rat treated with CD 34+ stem cells showing restoration of the normal architecture of the cortex,similar to that of the control group. There is slight increase in the density of the neurons in the three cortical layers [H&E x 400].(1d): A photomicrograph of a section in the cerebellum of a rat treated with CD 34- stem cells showing increased number of Purkinje cells and restoration of the normal architecture of the cortex,similar to that of the control group [H&E x 400].