Abstract
A monoclonal antibody that was prepared against human neuroblastoma cells was shown to react strongly with fetal brain and moderately with adult brain by quantitative absorption testing. Immunoperoxidase staining demonstrated expression of the antigen by neuronal precursor cells in the cerebellar external granular layer of a 24- to 26-week fetus but not by their mature derivatives in the granular and molecular layers of adult cerebellum. The antigen was also present on subventricular cells of fetal cerebral cortex, as well as adult and fetal astrocytes. The expression of this antigen by neuronal precursor cells in the external granular layer but not their mature derivatives suggests that it is a stage-specific marker for cerebellar neuronal development.
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